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Appendix 3 conditional sentences

The Main Clause

Conjunction

The Subordinate Clause

The Example

will + Simple Infinitive

will + Progressive Infinitive

The Imperative Mood

if

unless

in case

provided

that

The Present Simple The Present Progressive

I'll be glad if he comes.

I'll be seeing you tomorrow unless I'm held up at school.

Please phone me in case you can't come in time.

We'll give you a refund provided that you show our receipt, in case we don't get you'll get it you’ll get no money

would +Simple Infinitive

would +

+ Progressive Infinitive

might/could +

+ Simple Infinitive

might/could +

+ Progressive Infinitive

if

unless

The Past Indefinite

The Past

Subjunctive

("were")

If they knew about our problems, they would help us out.

If you had a thousand dollars, what would you do?

If I were you, I wouldn't be so

optimistic.

If John could be more assertive, he would certainly get the job.

If it were not for his stupidity, he wouldn't be in trouble.

would + Perfect Infinitive

would + Perfect Progressive Infinitive

might/could +

+ Perfect Infinitive

might/could +

+ Perfect Progressive Infinitive

if

unless

The Past Perfect

If Martha hadn't left her glasses at home, she would have seen the notice.

If he had been more attentive, he might have heard the

announcement.

If it hadn't been for the traffic jam, we might have got home in time.

Note: If it were not for his stupidity, he wouldn't be in trouble. = But for his stupidity, he wouldn't be in trouble.

If it hadn't been for the traffic jam, we might have got home in time. = But for the traffic jam we might have got home in time.