Perfect Infinitive with Modals | Could Have, Would Have, Should Have…

The structure “have + past participle” is called a perfect infinitive.

Learn how to use perfect infinitive with modal verbs in English: must have, can’t have, should have, shouldn’t have, needn’t have, ought to have, may have, might have, could have, would have.

Using Perfect Infinitives

Must Have + Past Participle

Usage:

Express a deduction about something that has happened. We feel quite sure about it.

Examples:

I didn’t hear her voice . She must have gone out.

It is very cold; it must have snowed in the mountains.

Can’t Have + Past Participle

Usage:

Describe a deduction about something that didn’t happen in the past based on present evidence.

Examples:

He can’t have fallen in love with her. She’s married.

She can’t have passed such a difficult exam.

Should Have + Past Participle

Usage:

Express the idea that something was desirable or needed but didn’t take place.

Examples:

She should have asked you before borrowing your pen.

You should have locked the door before leaving the house. (But you didn’t lock it.)

Shouldn’t Have + Past Participle

Usage:

Something took place but it wasn’t desirable.

Example:

She shouldn’t have taken the matter too seriously.

Needn’t Have + Past Participle

Usage:

Express that something was done but it wasn’t necessary. The person who did it thought it was necessary.

Examples:

When the party was over, I realized that you needn’t have cooked so much food as most of it was untouched.

I needn’t have knocked at the door since, in this way, I awoke the baby. (but I knocked)

Ought to Have + Past Participle

Usage:

Express an unfulfilled duty or obligation.

Example:

Paul ought to have waited until the lights were green before he crossed the street. (But he didn’t wait.)

May Have + Past Participle

Usage:

Express the possibility that an action took place in the past.

Example:

The little girl may have lost the key. (It is possible that she lost the key.)

Might Have + Past Participle

Usage:

Express a past possibility.

Example:

Our neighbors might have heard some noises when our car was stolen.

Could Have + Past Participle

Usage:

Express past reference about something that was not carried out.

Examples:

You could have done it. (You didn’t do it)

She could have called the doctor early in the morning. (She didn’t call the doctor)

Would Have + Past Participle

Usage:

Used in the Third Conditional.

Example:

I would have gone to university if my parents had had more money. (The speaker didn’t go to university.)

Perfect Infinitive with Modal Verbs | Picture

Perfect Infinitive with Modals | Could Have, Would Have, Should Have...

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1 responses on "Perfect Infinitive with Modals | Could Have, Would Have, Should Have..."

  1. you are the best…

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