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Place the preposition for before words or phrases denoting a period of time: for three days, for six weeks, for two years, for a few minutes, for a long time. Use it with any tense except the present.
For is often omitted. We can say: I've been here for two years or I've been here two years.
When speaking of a period of time in the future, use in, and not after. Here in means after the end of.
When you warn to show the means or the instrument with which the action is done, use with. By denotes the order of the action: The bird was shot by the man.
The following take by and not with: by hand, by post, by phone, by one's watch, by the hour, by the dozen, by the metre.