Conditionals Type 0 (true conditional)

If you heat water it boils.

Express something which is always true, laws of nature.

+ SIMPLE PRESENT IF + SIMPLE PRESENT

Conditionals Type 1.(real conditional)

If you study hard, you will get a good mark

Express a possible situation in the present or future.

IF + SIMPLE PRESENT + SIMPLE FUTURE

Conditionals Type 2(present unreal)

If you studied hard,you would get a

good mark

Express an imaginary or unlikely situation in the present or future.

IF + SIMPLE PAST + WOULD + VERB INFINITIVE

Conditionals Type 2WITH VERB TO BE.

If I were rich ,I would buy a castle.

IF + SIMPLE PAST WOULD + VERB INFINITIVE

If he were rich , He could buy a castle.

WOULD + VERB INFINITIVE

COULD + VERB INFINITIVENOTE: If I, he, she it was (socially accepted)

Conditionals Type 3.

If you hadn't been late for work so often,

they wouldn't have fired you.

Express imaginary situations which are contrary to facts in the past. It can be used to talk about wishes and regrets.

IF + PAST PERFECT WOULD HAVE + VERB PAST PARTICIPLE