5 TOEFL ITP Conditional Patterns + Inversion

Ever seen a TOEFL® question that starts with “Had he studied harder, …” and wondered whether it was a question? It isn’t. It’s a conditional sentence with the word if hidden.

In the TOEFL ITP Structure & Written Expression section (40 questions in 25 minutes), conditional sentences show up almost every time. The good news: the patterns are rigid. Once you know which clauses go together, you can answer these questions in seconds.

Here are the 5 patterns you need, from the basic types to inversion without if. (The slides below are in Indonesian, with the English examples.)

Why Conditionals Appear So Often

A conditional always has two clauses that must match: the if clause (the condition) and the main clause (the result). The test writer only needs to break one of them, for example by putting would in a Type 1 sentence or would avoid in a Type 3 sentence, and many test takers miss it because the sentence still “sounds” fine.

So the strategy is: check the verb form in the if clause first, then find the matching form in the main clause (or the other way around).

Pattern 1: Type 1, Real Possibility

Used for conditions that can actually happen now or in the future.

Formula: If + S + V1/Vs, S + will/can/may + V1

✅ If the temperature drops below zero, the water in the pipes will freeze. ✅ If you submit the form today, you can join the class next week. ❌ If the temperature drops below zero, the water in the pipes would freeze.

The if clause uses the Simple Present (drops), so the main clause uses will, can, or may + base verb. Would does not belong to Type 1. It is used in Type 2 (would + base verb) and Type 3 (would have + past participle).

Note: For general facts and laws of nature, English also has the zero conditional (If + Present, Present), as in If water reaches 100°C, it boils. In TOEFL questions, the correct option is usually will + base verb or the Simple Present, never would.

Pattern 2: Type 2, Imaginary Present

Used for situations that are contrary to present fact.

Formula: If + S + V2/were, S + would/could/might + V1

✅ If I had more time, I would join the club. (Fact: I don’t have time.) ✅ If he were the manager, he would approve the budget. (Fact: he isn’t the manager.) ❌ If he was the manager, he would approve the budget.

In unreal Type 2 conditionals, formal English uses were for every subject, including I, he, she, it. Was is common in casual speech, but TOEFL tests formal written English, so choose were.

Be careful: this rule applies only to unreal conditions. A sentence like If he was late, he apologized is an ordinary statement about the past (he may really have been late), and was is correct there.

Pattern 3: Type 3, Past Regret

Used for imagining a different outcome for a past event that already happened.

Formula: If + S + had + V3, S + would/could have + V3

✅ If the driver had seen the red light, the collision would have been avoided. ❌ If the driver had seen the red light, the collision would avoid.

In reality, the driver didn’t see the light and the collision happened. Would avoid is wrong because it belongs to Type 2. Notice the passive too: the collision was avoided (it didn’t avoid anything), so the right form is would have been avoided.

Pattern 4: Inversion Without IF

This pattern often separates scores in the 500s from 550 and above. The word if is dropped and the auxiliary moves in front of the subject.

Normal form	Inverted form
If he had reviewed it	Had he reviewed it
If I were you	Were I you
If she were to call	Were she to call
If you should need help	Should you need help

Sample question:

”_____ more carefully, he would have noticed the error.”

(A) He had reviewed (B) Had he reviewed (C) He reviewed (D) If he reviewing

Answer: (B)

Option (A) leaves the sentence with two clauses and no connector. Option (B) is the standard inversion of If he had reviewed and matches would have noticed (Type 3). So when a conditional has no if, look for an option that starts with Had, Were, or Should.

Pattern 5: The Unless Trap

Unless = if … not. Because the meaning is already negative, the clause after unless normally doesn’t need another negative.

❌ Unless the committee does not approve the plan, the construction will begin. ✅ Unless the committee approves the plan, the construction will not begin. ✅ If the committee does not approve the plan, the construction will not begin.

The first sentence means “if the committee does not not approve”, which makes no sense. In Written Expression, unless followed by not / doesn’t / didn’t is almost always the error.

Summary of the 5 Patterns

Pattern	IF clause	Main clause	Meaning
Type 1	V1/Vs	will/can/may + V1	Real possibility
Type 2	V2 / were	would/could + V1	Imaginary present
Type 3	had + V3	would have + V3	Past regret
Inversion	Had/Were/Should + S	depends on type	Same as if
Unless	Unless + positive clause	depends on type	If not

Quick Quiz

If it _____ tomorrow, we will cancel the trip. (rains / rained)
If I _____ rich, I would travel the world. (was / were)
_____ the instructions, she would have finished on time. (Had she read / She had read)
Unless you _____ the deadline, your paper will be accepted. (miss / don’t miss)

Answers:

rains (Type 1, paired with will).
were (Type 2, the formal form for every subject).
Had she read (Type 3 inversion, paired with would have finished).
miss (unless is already negative).

If your verb forms still feel shaky, review the Guide to the 12 Tenses first.

Practice Conditionals for Real

Knowing the formulas is step one. To react instantly with the 25-minute clock running, you need practice with many question variations.

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