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This question already has an answer here:

I always get confused in using will and shall.

Same way when to use must and should.

marked as duplicate by choster, mmyers, Ste, Zibbobz, tchrist Nov 14 '13 at 17:23

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"Will" and "Shall" are very nearly synonyms, and I can't think of any place where one can be used but not the other. Also, this question seems to have been answered already here.

But "Must" and "Should" are entirely different (and you should probably ask a separate question for these two words). The short answer though is that "Must" is definitive, and "Should" is not. "Should" indicates a likelihood that an activity is something that one needs to do, while "Must" is an activity where there is no option to do it or not (and thus, using it to say someone should do something would be a hyperbole)

  • "Shall we go?" is different from "Will we go?", for example. – tchrist Nov 14 '13 at 17:23
  • @tchrist True, I hadn't thought of that one. Still, the question seems to have already been answered elsewhere in any case. – Zibbobz Nov 14 '13 at 17:25

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