English · Grammar · SSC & HSC
Transformation of Sentences — Rules, Examples & Exercise
Change simple to complex to compound, affirmative to negative, assertive to interrogative — every transformation rule with examples.
Transformation of sentences means rewriting a sentence in a different grammatical form without changing its meaning. The board sets three families: structure (simple ⇄ complex ⇄ compound), sense (affirmative ⇄ negative), and type (assertive ⇄ interrogative ⇄ exclamatory ⇄ imperative). Each family has a small set of fixed conversions, so the work is recognising which family a question belongs to.
Where it is set: SSC & HSC English 2nd Paper — Grammar
Simple, complex and compound
The first family of transformations changes a sentence's structure while keeping its meaning. The three structures differ only in how many clauses they contain and how those clauses are joined, so converting between them is a matter of adding or removing a subject-and-verb pair.
A simple sentence has one clause with one finite verb. A complex sentence has a principal clause plus at least one subordinate clause introduced by a subordinating conjunction. A compound sentence has two principal clauses joined by a coordinating conjunction.
The standard conversions
| From simple | To complex | To compound |
|---|---|---|
| In spite of his poverty, he is happy. | Though he is poor, he is happy. | He is poor but he is happy. |
| Being ill, he could not come. | As he was ill, he could not come. | He was ill and so he could not come. |
| I know his address. | I know where he lives. | — |
| He is too weak to walk. | He is so weak that he cannot walk. | He is very weak and cannot walk. |
| Without working hard, you cannot succeed. | If you do not work hard, you cannot succeed. | Work hard or you cannot succeed. |
- ✓ Simple: Owing to his illness, he failed. → Complex: As he was ill, he failed. → Compound: He was ill and so he failed.
- ✓ Simple: I saw a man carrying a box. → Complex: I saw a man who was carrying a box.
The signal words that tell you which conversion to make
Each structure announces itself with a small set of words. Spotting one of them tells you what you are converting from, and therefore what you are converting to.
- Simple sentence markers: a participle (Being, Having), an infinitive (to work), a preposition phrase (In spite of, Because of, Owing to, Without, Besides), too … to.
- Complex sentence markers: a subordinating conjunction — though, although, because, since, as, if, unless, when, while, that, who, which, where.
- Compound sentence markers: a coordinating conjunction — and, but, or, so, yet, and so, otherwise, therefore.
- ✓ “In spite of” → simple, so the complex version starts with “Though”.
- ✓ “Though he tried hard, he failed.” → compound: “He tried hard but he failed.”
Affirmative and negative
The second family reverses the polarity of a sentence without changing what it says. This is done by pairing a negative word with a word of opposite meaning, so the two negatives cancel out.
| Affirmative | Negative |
|---|---|
| He is a good boy. | He is not a bad boy. |
| Only Rahim can do it. | None but Rahim can do it. |
| I must obey my parents. | I cannot but obey my parents. |
| Everyone respects him. | There is no one who does not respect him. |
| He is too weak to walk. | He is so weak that he cannot walk. |
| As soon as he came, we left. | No sooner had he come than we left. |
| He is the best boy in the class. | No other boy in the class is so good as he. |
- ✓ Affirmative: Only Allah can help us. → Negative: None but Allah can help us.
- ✓ Affirmative: Everybody loves flowers. → Negative: There is nobody who does not love flowers.
Assertive, interrogative, imperative and exclamatory
The third family changes the type of the sentence. An assertive sentence becomes interrogative by turning it into a rhetorical question of the opposite polarity — the question expects the same answer the statement gave, which is why the meaning is preserved.
| Type change | Method | Example |
|---|---|---|
| Assertive → Interrogative | Reverse the polarity and add a question mark | Everybody wishes to be happy. → Who does not wish to be happy? |
| Assertive → Exclamatory | Begin with How, What or Alas | The scenery is very beautiful. → How beautiful the scenery is! |
| Assertive → Imperative | Drop the subject and use the base verb | You should respect your teachers. → Respect your teachers. |
| Imperative → Assertive | Add a subject and a modal | Do the work. → You are requested to do the work. |
| Exclamatory → Assertive | Replace How/What with very/a great | What a fool he is! → He is a great fool. |
- ✓ Assertive: There is no use of crying over spilt milk. → Interrogative: What is the use of crying over spilt milk?
- ✓ Exclamatory: How happy the boy is! → Assertive: The boy is very happy.
Degree, voice and the other single-step changes
Board papers often place a change of degree or a change of voice inside a transformation question. Both follow the same principle as everything above: a fixed pattern, applied without altering the meaning.
- Positive → Comparative: No other boy is so tall as Karim → Karim is taller than any other boy.
- Comparative → Superlative: Karim is taller than any other boy → Karim is the tallest boy.
- Active → Passive: move the object to the front, use be + past participle, put the doer after by.
- Too … to → So … that: He is too weak to walk → He is so weak that he cannot walk.
- Since / As → Because of + noun: As he was ill, he stayed at home → Because of his illness, he stayed at home.
- ✓ Positive: Very few metals are as useful as iron. → Superlative: Iron is one of the most useful metals.
- ✓ Active: He wrote a letter. → Passive: A letter was written by him.
Practice
Work through these before you check the answers — the reasoning matters more than the answer.
- Make it complex: In spite of his poverty, he is honest.
- Make it simple: As he was ill, he could not attend the meeting.
- Make it compound: Though he worked hard, he failed.
- Make it negative: Only he can solve the problem.
- Make it interrogative: Everybody wants to be rich.
- Make it exclamatory: The girl is very clever.
- Make it comparative: No other boy in the class is so tall as Rahim.
- Make it complex: He is too weak to carry the box.
Answers
- Though he is poor, he is honest.
- Being ill, he could not attend the meeting.
- He worked hard but he failed.
- None but he can solve the problem.
- Who does not want to be rich?
- How clever the girl is!
- Rahim is taller than any other boy in the class.
- He is so weak that he cannot carry the box.
Frequently Asked Questions
Count the finite verbs. One finite verb means a simple sentence. Two or more with a subordinating conjunction (though, because, if, that, who, when) means complex. Two or more with a coordinating conjunction (and, but, or, so) means compound. Participles and infinitives are not finite verbs, so they do not count.
No — and that is the whole test. If your transformed sentence says something even slightly different from the original, it is wrong however grammatical it looks. After writing your answer, read both sentences together and check that they could be used interchangeably.
They mean the same thing and convert directly into each other, but “too … to” is a simple sentence (one clause, an infinitive) while “so … that” is complex (two clauses). Note the polarity flip: “too weak to walk” becomes “so weak that he cannot walk” — the negative appears in the complex version.
Simple ⇄ complex ⇄ compound is the largest share, followed by affirmative ⇄ negative and change of degree. Assertive → interrogative and exclamatory conversions appear regularly but in smaller numbers. Practising the first three families covers most of the marks in the item.
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