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First Conditional vs Second Conditional

Zero Conditional

Estructure:

Conditional clause "If" + result clause

(Present simple + Present simple)

It's used to give instructions or orders.

First Conditional

We use it to talk about things that are possible in the future and there's a likely chance of it happening.

Estructure:

Conditional clause "If" + result clause

(Present simple + will/won't)

Second Conditional

Used to talk about something that is unlikely to happen in the future.

Used to talk about something impossible and to give advice.

Estructure:

Conditional clause "If" + result clause

(Past simple + would)

Use "were" (e.g. If he were...)

Third Conditional

Used to talk about an imaginary situation in the past.

Estructure:

Conditional clause "If" + result clause

(Past perfect o PPC + would + have + past participle)

Without "If"

You can use "Unless" or "Supposing".

Without "If"

You can use "As long as"