必须，必需，要， 怎么用？ I know the basic translations 必须 have to 必需 need 要 want I think 要 can also mean want and need (right?) Are they always interchangeable? For example can you say 我必须去回家 我必需去回家 我要去回家 to mean "I have to go home" ?

你们为什么要学习德语？

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Lisa