When we are talking about something in the past which cannot be altered now, we use:. Function 3rd Conditional:. When we are thinking about facts which are generally true, we use:. Zero Conditional function:. This structure is common when talking about possible plans, promises, warnings, threats or for persuading someone. We are predicting a likely result in the future if a condition is fulfilled. 1st Conditional function:. You can also use the modal verbs MAY, MIGHT and COULD when:. When we are thinking about a situation in the present or future that is hypothetical, unlikely or impossible, we use:. Second Conditional function:. COULD can be used instead of WOULD to:.
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