Conditionals

Conditional sentences express a condition (if…) and the consequence of the condition.
The consequence can be expressed before or after the condition:
If you come to Canada, we can visitVancouver = we can visit Vancouver if you come to Canada.
Note: if the condition comes first, a comma is used. If the consequence comes first, no comma is used.-------------------------------------------------
1º - Zero conditional.
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If + present tense, -present tense: if the teacher is late, it sets a bad example to the class.-------------------------------------------------
Zero conditional is used to express:
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Things that are always or generally true: people get annoyed ifyou shout at them
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Scientific facts: if water boils, it evaporates

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2º - First conditional.-------------------------------------------------
If/Unless + present tense, - future tense/modal verb (may, should, can, etc.)/imperative:
-------------------------------------------------If you wash the car, it will look much smarter. Future tense
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You can have an ice-cream if you behave well. Modal-------------------------------------------------
If he phones, tell him I’m in a meeting. Imperative
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I won’t phone unless it’s urgent. Future negative-------------------------------------------------
You shouldn’t go swimming unless you think it’s safe. Modal
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The first conditional is used toexpress a future condition the speaker thinks is possible or likely: if I get the job, I’ll buy myself a new car.

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3º Second conditional...