Conditionals are a type of sentence in English that refer to a real or unreal situation in the past, present or future. We sometimes call them 'if' clauses, because the word 'if' is normally the key part of this type of sentence.
There are four types of conditional sentence, the zero, first, second and third conditionals. There is also a mixed conditional, where it is possible to put different parts of the four types together to express different times in the same sentence.
For example, we could say "If it rains, I will stay at home". This is a common example of the first conditional. It is used to refer to a real or possible situation in the future. A conditional sentence has two parts: the 'if' clause and the main clause.
In this series of video lessons, you will learn all about the four different types of conditional sentence as well has how to use them in context. You will see lots of examples to make it very clear how we use them, when and why.