Will - It is used to express a promise, a prediction or something that you want to do in the future., If - It helps us to be able to talk about hypotheses in the past or about conditions with their future consequences.The pincipal conditional, Can - It is used especially to talk about a skill or capacity in general., Could - It is used to express possibility or some past ability, Would - It is used when we want to be very polite when asking someone for something or when inviting someone to do something.,

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