Sometimes we call them 'if clauses'. They describe the result of something that might happen (in the present or future) or might have happened but didn't (in the past) . They are made using different English verb tenses.

Actually there are 5 types of Conditionals in English Grammar:

1) Zero conditional

(if + present simple, ... present simple) If you heat water to 100 degrees, it boils.

2) First conditional

(if + present simple, ... will + infinitive) If it rains tomorrow, we'll go to the cinema.

3) Second conditional

(if + past simple, ... would + infinitive) If I had a lot of money, I would travel around the world.

4) Third conditional

(if + past perfect, ... would + have + past participle) If I had gone to bed early, I would have caught the train.

5) Mixed conditional

(if+ any grammatical time from previous types, ... any grammatical time from previous types)

The most important thing that we should remember when we learn conditionals: NEVER USE WILL+INFINTIVE (FUTURE SIMPLE) after IF.

This week we will practice Second conditional, that is why remember the construction:)