Tenses after “when,” “if,” “before,” “after,” and “as soon as”

What tenses should I use after these adverbs, Present Simple or Present Perfect? Is it possible to use the Future Simple?

Answer

Present perfect conveys a sense of the end of the action, whereas present simple conveys a sense of the beginning or middle. For example,

As soon as I have eaten, I will help you with that.

As soon as I eat, my stomach starts grumbling.

The first sentence refers to once the eating is done, but the second sentence refers to when the eating starts. Simple future is never used here.

Attribution
Source : Link , Question Author : Artem Merkotun , Answer Author : Jakob Weisblat

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