Conditional sentences

Watch this video and you will learn how to make conditional sentences

We form conditionals with two different clauses:

If clause (conditional) and main clause (result clause), the order is the same but if we start with the if clause we need a comma to separate both clauses.

There are four different kinds of conditionals

Zero Conditional:
General truths
If/ When + present simple      Present simple

If you heat water at 100 degrees, it boils
If you don't have your umbrella, when it rains, you get wet

First conditional
Probable conditional

If/ Unless + Present simple      Will+verb
                                                 Imperative 
                                                 Modal+verb

If people see Antarctica's beauty, they 'll understand why it's important

Call me if you want to come to the concert tonight

If the station is closed, you can buy the tickets on the Internet

Second conditional
Unlikely conditional

If + Past Simple                      would+verb
                                                 

If people saw Antarctica's beauty, they 'd understand why it's important

If I were you, I 'd  buy the tickets on the Internet


Third conditional
Impossible conditional

If + past perfect                       would+present perfect
                                                 

If people had seen Antarctica's beauty, they 'd have understood why it's important

If I had known that all the tickets were sold out, I 'd have bought them on the Internet

Now that you have learnt the theory, it's time to watch these videos