Conditional sentences

Hello!

There are four types of conditional sentences:

-Type 0: If+suj+present simple, suj+present simple.
Ex: If you boil the water, It boils.

-Type 1: If+suj+present simple, suj+ will+infinitive.
To talk about predictions or something that will be happen certain.
Ex: If it rains, I will stay at my home.

-Type 2: If+suj+past simple, suj+would+infinitive.
To talk about wishes, dreams or something we want to happen.
Ex: If I won the lottey, I would buy a new car.

-Type 3: If+suj+ past perfect simple, suj+would have+participle.
To talk about the impossibility of something had been happened.
Ex: If I had been an astronaunt, I would have travelled to the moon.

In these, "will" or "would" can be changed for: could, may, might...
"If" also can be changed for: provided that, as long as, supossed that...
Unless is frecuently to be in the first conditional and it replace if+not. For example:
If it doesn't rain, I'll go to the beach= Unless rains, I'll go to the beach.
In addition, we can change the order of the sentences, but we haven't to put a comma. For example:
I would take a lot of photos if I went to London.

Here there are many examples to practise it:
Exercise 1
Exercise 2
Test