Zero conditional, We use zero conditional to talk about things and conditions which are always true, like a scientific fact, First conditional, It is used to talk about possibilities that concern the present or the future. It refers to conditions which can actually take place., Second conditional, It is used to talk about present and future events and conditions which are improbable to come true, Third conditional, It is used to talk about past events and conditions which can no more take place or which are to be considered impossible.

Conditional

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