4.4 Conditional Sentences & Hypothetical Structures
Key Takeaways
- Conditionals are a named line item in the NTS curriculum, worth 5% of the verbal segment in every GAT General category.
- The four core patterns are zero (general truth), first (real future), second (unreal present), and third (unreal past).
- The second conditional uses past forms for present unreality, and formal English prefers 'were' for all persons: If I were you.
- The third conditional pairs 'had + past participle' in the if-clause with 'would have + past participle' in the main clause.
- Never write 'will' or 'would' inside the if-clause of a standard conditional; the modal belongs in the main clause.
Conditional Sentences & Hypothetical Structures
B3: Conditionals appears in the official NTS GAT General curriculum as its own line at 5% of the verbal segment — around 2 questions on GAT-A and 3 on GAT-B or GAT-D. Because conditionals are governed by rigid patterns, this is one of the few grammar topics you can raise from unreliable to near-perfect in a single study session.
Every conditional has two halves: the if-clause (the condition) and the main clause (the result). Either may come first. When the if-clause leads, a comma separates them; when it follows, no comma is used.
The Four Standard Patterns
| Type | If-clause | Main clause | Meaning |
|---|---|---|---|
| Zero | present simple | present simple | general truth, always valid |
| First | present simple | will + base verb | real, possible future |
| Second | past simple | would + base verb | unreal or unlikely present |
| Third | had + past participle | would have + past participle | unreal past, contrary to fact |
Zero Conditional — Laws and Routines
If you shade two circles for one question, NTS marks it zero.
Both halves are present simple. Substituting when for if changes almost nothing, which is a reliable test for the zero type. Use it for scientific facts, institutional rules, and standing habits.
First Conditional — Real Future Possibility
If you register before the deadline, you will pay only Rs. 1,810.
The condition is genuinely open. Instead of will, the main clause may carry can, may, might, should or an imperative: If your slip is missing, print another copy.
The cardinal error: If you will register early, you will pay less. Never put will in the if-clause of a first conditional. Distractor options exploit this constantly.
Second Conditional — Unreal or Unlikely Present
If I had more time, I would revise the whole geometry chapter.
The past form does not indicate past time; it signals distance from reality. The speaker does not have more time.
In careful and examination English, the verb be takes were for every person in the second conditional — the subjunctive: If she were the registrar, she would extend the deadline. If I were you, I would attempt every question. An option offering If I was you is written to be rejected.
Third Conditional — Unreal Past and Regret
If I had known about the late-fee deadline, I would have paid on time.
Both events are counterfactual: the speaker did not know, and did not pay on time. The main clause may substitute could have (ability) or might have (possibility) for would have.
The cardinal error: If I would have known… This is never correct in written English. Would belongs in the main clause only.
Mixed Conditionals
A mixed conditional joins a past condition to a present result, or a present condition to a past result — the two halves are drawn from different types.
| Pattern | Structure | Example |
|---|---|---|
| Past condition → present result | had + past participle / would + base verb | If I had studied grammar properly, I would be far more confident today. |
| Present condition → past result | past simple / would have + past participle | If he were more organised, he would have submitted the form on time. |
The first is far more common on tests: a past action that continues to shape the present.
Unless, Provided That, and Other Conditional Links
- unless ≈ if not, and therefore takes an affirmative verb: You cannot enter unless you have your original CNIC. Writing unless you do not have is a double negative and wrong.
- provided that / as long as / on condition that introduce a stipulation: You may retake the test provided that you register afresh.
- in case expresses precaution rather than condition: Carry two pens in case one fails.
- even if concedes: Even if you finish early, you may not leave your seat.
Inverted Conditionals
Formal registers drop if and invert subject and auxiliary. NTS uses these in the more difficult items:
| Standard | Inverted |
|---|---|
| If I were the controller, … | Were I the controller, … |
| If he had applied earlier, … | Had he applied earlier, … |
| If you should need help, … | Should you need help, … |
Only were, had and should invert. There is no inverted form of a first conditional with do.
Worked Examples
Item 1: If the roll number slip ______ by Friday, contact the NTS helpline.
The main clause is an imperative describing a real future contingency, so the if-clause takes present simple: does not arrive. A candidate who reaches for will not arrive has fallen for the standard first-conditional trap.
Item 2: Nadia missed the standard deadline and paid Rs. 2,510. If she ______ two days earlier, she ______ Rs. 700.
Both halves are contrary to fact in the past, so this is a pure third conditional: had registered … would have saved.
Item 3: He is exhausted today because he sat up all night. If he ______ properly, he ______ so tired now.
The condition is past, the result is present — a mixed conditional: had slept … would not be.
Two-second check: locate the modal. If will or would sits inside the if-clause, the option is almost certainly the planted error.
Complete the sentence: "If the fee ______ before the closing date, the candidate pays only Rs. 1,810."
Which sentence is a correctly formed third conditional?
Rewrite in inverted form: "If I were the controller of examinations, I would publish the keys sooner."
Which sentence uses "unless" correctly?