有shalln't的用法吗 另外还有can/shall have done吗

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• 有shalln't的用法吗 另外还有can/shall have done吗
• 英语中,here it is 和 here you are 的区别.请问,英语中,here it is 和 here you are 的区别是什么?他们的意思不都是“给你”吗但是用法有什么不同啊?是here it is 用在单数中,而here you are 用在复数中吗?还有一道英语题：-----Can I have a cup of tea?-----Yes,( )选项：A.here it is B.here you are
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• 有shalln't的用法吗 另外还有can/shall have done吗
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