Mandarin · Chapter 3 · Lesson 4 · Grammar primer
Modal verbs: 会, 想, 要, 应该, 可以
The five core modals: learned-ability vs likelihood, want, need, should, may. Where they sit in the sentence and how to negate each.
The short version
The opposite of must is 不用 (bú yòng), not 不必须 (bú bì xū)
必须 (bì xū) does not negate the way English 'must' does. Its negative is 不用 (bú yòng) or 不必 (bú bì), meaning 'you don't need to' rather than 'you must not'. For an actual prohibition you want 不能 (bù néng) or 别 (bié). 不必须 (bú bì xū) is ungrammatical and it catches everyone at least once.
你不用来。 Nǐ bú yòng lái.
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