Skip to content

ISC Class 12 Sentence Transformation: Structures

questionbuddy.in/isc/class-12/english-language/grammar-structure-and-usage/sentence-transformation-fixed-structures

English LanguageISC Class 12 · Grammar, Structure and Usage

Sentence Transformation: Fixed Structures and Common Errors (ISC Class 12 English Language)

Updated 18 October 2026 · Fact-checked

Transformation items (5 marks, one mark each) ask you to rewrite a sentence as instructed without changing its meaning. Learn the fixed structures: No sooner did...than; Hardly had...when; Not only did...but also; No other...as...as; whether/if in reported questions; the passive when told to end with the agent; so...that for too...to. Use the exact words asked, spell carefully and check tense.

Match each original pattern on the left to its fixed structure on the right, and remember that the opening negative word forces the auxiliary before the subject

Illustration drawn for QuestionBuddy.

Understand Sentence Transformation: Fixed Structures and Common Errors

1. The task. Question 3 (15 marks) has three parts; part (i) is five sentence transformations of one mark each, rewritten according to the instruction in brackets (Begin, End, Use). The meaning must not change. The advised time for the whole question is not more than 30 minutes.

2. Inversion. When a negative or restrictive adverb begins a sentence, the auxiliary comes before the subject. 'No sooner' takes did + base verb and then than; 'Hardly' and 'Scarcely' take had + past participle and then when; 'Not only' at the start also inverts.

  • As soon as the bell rang, the students rushed out. Begin: No sooner... gives *No sooner did the bell ring than the students rushed out.*
  • Begin: Hardly... gives *Hardly had the bell rung when the students rushed out.*
  • She sings well and also dances gracefully. Begin: Not only... gives *Not only does she sing well, but she also dances gracefully.*

3. Degrees of comparison. A superlative can be rewritten in the comparative or the positive. With 'Begin: No other' use the positive degree with as...as and keep the noun after 'No other' singular.

  • Mount Everest is the highest peak in the world. gives *Mount Everest is higher than any other peak in the world.* and *No other peak in the world is as high as Mount Everest.*

4. Reported speech. Yes or no questions are reported with if or whether; wh-questions keep the wh-word; statement word order follows and no question mark. After a past reporting verb tenses move back (will to would, is to was, did to had done), pronouns change, and time words shift (tomorrow to the next day, yesterday to the previous day, here to there).

  • Ravi said to Mona, 'Did you submit the project yesterday?' gives *Ravi asked Mona whether she had submitted the project the previous day.*

5. Voice. An instruction such as 'End: ...the committee' forces the passive. Keep the tense: has rejected becomes has been rejected.

  • The committee has rejected the proposal. gives *The proposal has been rejected by the committee.*

6. Too...to, so...that, enough. 'Too + adjective + to' becomes 'so + adjective + that + subject + cannot or could not'.

  • The tea was too hot to drink. gives *The tea was so hot that it could not be drunk.* (or ...that we could not drink it.)

7. Conditionals. 'Unless you work hard, you will not pass' becomes *If you do not work hard, you will not pass.*

8. Marking cautions. Examiners noted the wrong verb form after did, no inversion after not only, misspelt words (whether, debater, every day written as one word), the full stop placed outside quotation marks, and a changed meaning. Write one answer per item and do not copy the instruction.

9. Scoring plan (imaginary). With 5 items at 1 mark each, spending 6 minutes on these items out of a total of 30 for the question leaves 24 minutes for the other two parts, i.e. 12 minutes each for 10 items of half a mark: about 1.2 minutes per item.

Sentence Transformation: Fixed Structures and Common Errors: key facts

Inversions
  • No sooner did + base verb + than
  • Hardly had + past participle + when
  • Not only did + base verb + but also
Auxiliary before subject.
Degrees
  • Superlative
  • Comparative than any other
  • Positive No other as ... as
Singular noun after No other.
Reported speech shifts
  • will to would
  • tomorrow to the next day
  • yesterday to the previous day
  • here to there
  • question to if or whether
After a past reporting verb.

How to answer Sentence Transformation: Fixed Structures and Common Errors questions

Use this routine for each transformation item.

  1. 1Read the instruction (Begin, End, Use) and decide which structure is needed.
  2. 2Keep the tense and meaning of the original.
  3. 3Apply the fixed pattern, with inversion where required.
  4. 4Check verb forms, spelling and punctuation.
  5. 5Write only the transformed sentence, not the original.

Sentence Transformation: Fixed Structures and Common Errors in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Inversion

Suppose a notice says: 'As soon as the lights went out, the audience started clapping.'

Rewrite beginning 'No sooner'.

Try it first, then show the solutionSolution
  1. Past event: use did + base verb.
  2. Join with than.

Answer: No sooner did the lights go out than the audience started clapping.

Memory hook: No sooner did ... than.

Reported speech

Imagine a teacher asked, 'Have you finished the exercise?'

Report it to a parent next day.

Try it first, then show the solutionSolution
  1. Yes or no question: use whether or if.
  2. Present perfect becomes past perfect; use statement order.

Answer: The teacher asked whether I had finished the exercise.

Memory hook: Question becomes a statement.

Tricks to remember Sentence Transformation: Fixed Structures and Common Errors

Short memory aids. Say each one aloud once, then use it on a question the same day.

  • No sooner did, than

    Sooner pairs with than; hardly pairs with when.

    Use it when: Choosing the connector.

  • Past reporting, past shift

    If the reporting verb is past, every tense steps back.

    Use it when: Reported speech.

Sentence Transformation: Fixed Structures and Common Errors: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Inversion with hardly · 1 mark · Short answerBoard level

Rewrite beginning 'Hardly': As soon as the match began, it started to rain.

Try it first, then show the solutionSolution
  1. Hardly takes had + past participle and when.
  2. The first action is the match beginning.

Answer: Hardly had the match begun when it started to rain.

Example 2: Degrees · 1 mark · Short answerBoard level

Rewrite beginning 'No other': Anita is the most punctual student in our class.

Try it first, then show the solutionSolution
  1. Use the positive degree with as...as.
  2. Keep the singular noun after No other.

Answer: No other student in our class is as punctual as Anita.

Example 3: Reported speech · 2 marks · Short answerHarder board level

Rewrite in indirect speech: (a) The captain said to the team, 'Will you be ready by tomorrow morning?' (b) Meena said, 'I am leaving here today.'

Try it first, then show the solutionSolution
  1. (a) Yes or no question: whether; will to would; you to they; tomorrow to the next day.
  2. (b) am leaving to was leaving; here to there; today to that day.

Answer: (a) The captain asked the team whether they would be ready by the next morning. (b) Meena said that she was leaving there that day.

Example 4: Voice and result · 2 marks · Short answerHarder board level

Rewrite as instructed: (a) The storm has damaged several houses. (End: ...the storm.) (b) The box was too heavy to lift. (Use: so...that)

Try it first, then show the solutionSolution
  1. (a) Passive keeps the present perfect: have been damaged; the agent is the storm.
  2. (b) Too heavy to lift becomes so heavy that we could not lift it.

Answer: (a) Several houses have been damaged by the storm. (b) The box was so heavy that we could not lift it.

Example 5: Five-item set · 5 marks · Long answerHOTS / competency

Rewrite as instructed: (1) She sings sweetly and also writes songs. (Begin: Not only...) (2) Unless you leave now, you will miss the train. (Begin: If...) (3) He is too tired to continue. (Use: so...that) (4) Delhi is larger than most other cities in India. (Begin: Very few...) (5) The workers completed the bridge in a year. (End: ...by the workers.)

Try it first, then show the solutionSolution
  1. (1) Not only does she sing sweetly, but she also writes songs.
  2. (2) If you do not leave now, you will miss the train.
  3. (3) He is so tired that he cannot continue.
  4. (4) Very few cities in India are as large as Delhi.
  5. (5) The bridge was completed in a year by the workers.

Answer: The five transformed sentences as listed.

Where students lose marks in Sentence Transformation: Fixed Structures and Common Errors

The slips examiners see most often, and what to write instead.

  • Mistake: Wrong verb form after did

    Did takes the base verb.

    Wrong working

    No sooner did the students entered...

    Right working

    No sooner did the students enter...

    Do this: did + base verb.

    Usually costs: 1 mark.

  • Mistake: No inversion after not only

    The auxiliary precedes the subject.

    Wrong working

    Not only she sings...

    Right working

    Not only does she sing...

    Do this: Invert.

    Usually costs: 1 mark.

  • Mistake: Changing the meaning

    Transformation must keep the meaning.

    Wrong working

    Landslides caused heavy rains (for 'heavy rains caused landslides').

    Right working

    Landslides were caused by heavy rains.

    Do this: Check who does what.

    Usually costs: 1 mark.

Exam tips

  • Spend not more than 30 minutes on Question 3 as a whole.
  • Write only the new sentence, with the answers in order.
  • Spell whether, debater and every day correctly.
  • Place the full stop inside the quotation marks in direct speech.

Practice questions on Sentence Transformation: Fixed Structures and Common Errors

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

  1. Q1 · 1 mark · Very short answerBoard level

    Which connector completes: No sooner did the train arrive ___ the passengers rushed in?

    Hint

    Sooner pairs with...

    Answer

    than

  2. Q2 · 1 mark · Short answerBoard level

    Rewrite beginning 'Not only': He is a good singer and a fine dancer.

    Hint

    Invert.

    Answer

    Not only is he a good singer, but he is also a fine dancer.

  3. Q3 · 1 mark · Short answerHarder board level

    Rewrite in the passive, ending with 'by the teacher': The teacher will announce the results tomorrow.

    Hint

    Keep the future tense.

    Answer

    The results will be announced tomorrow by the teacher.

  4. Q4 · 2 marks · Short answerHarder board level

    Rewrite as direct speech: The doctor asked Rita whether she had taken the medicine the previous day.

    Hint

    Restore the tense and time word.

    Answer

    The doctor said to Rita, 'Did you take the medicine yesterday?'

  5. Q5 · 2 marks · Short answerHOTS / competency

    A student rewrites 'Rahul is the tallest boy in the class' beginning 'No other' as 'No other boy in the class is taller than Rahul.' Evaluate the answer.

    Hint

    Which degree is needed?

    Answer

    The meaning is right, but the instruction 'Begin: No other' requires the positive degree with as...as. The correct answer is 'No other boy in the class is as tall as Rahul.' The comparative form is a different structure.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

  1. 1.What follows 'No sooner did'?Show answer

    The base verb, then 'than'.

  2. 2.What follows 'Hardly had'?Show answer

    A past participle, then 'when'.

  3. 3.How is a yes/no question reported?Show answer

    With if or whether.

  4. 4.Which degree follows 'No other'?Show answer

    The positive degree with as...as.

Sentence Transformation: Fixed Structures and Common Errors: frequently asked questions

How many transformations are set?

Five, one mark each, as stated on the chapter page.

Can I use if or whether?

Yes, for yes/no questions.

Where do phrasal verbs appear?

They are part (ii) of the same question and are covered separately.