你好, 应该是：
They won't leave untill you come back.
not until句型，只到....才...
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They will not leave until you come back.
not ... until... 不...直到...
they will be always waiting for you before you coming back then leave.
。。。
not ……until 直到……才
应该是They will not leave until you come back,希望对你有用
They will always wait for you to come back before I leave here.
they will wait until you come back then leave
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