I can manage the shopping alone. You ____ come with me.

Are those just the same thing? I mean it sounds natural if I interchange each of those, but let's see the example from my book:

  • Everything will be OK. You needn't worry. (It is not necessary)

  • Everything was OK. You needn't have worried. (you worried, but it was not necessary)

Does that mean needn't have is used when something is done and needn't is used when something is going to happen or what?

What about don't have to?

And consider about this:

You ______ anymore. Which one should I put? "will" and "was/were" are not mentioned. In this case I don't know if the thing is going to happen or has happened.

  • There is no needn't have to construction in English with the sense of need not be obliged to [do something]. The word have in You needn't have worried is only there because it's part of the Present Perfect construction [you] have worried. May 27 '21 at 11:45
  • You needn't have worried (no to) - You were worried about a situation, but there was no need to because it turned out well. You needn't worry - everything is OK now, or a future situation is expected to turn out well. You don't have to worry means the same. You don't have to worry any more - things have turned out well. May 27 '21 at 12:42

These are two ways of expressing the same thing. In modern American vernacular you will not hear "needn't" used, unless it is ironically or to hark back to older ways of speaking.

Also, "you needn't have (done something)" would be a rough equivalent of "didn't have to do (something)."

You needn't have shot the man. You didn't have to shoot the man.

Those mean the same thing.

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