There can't be anyone waiting outside.
=There can’t be anyone who is waiting outside.
备注(1):can’t为情态动词否定推测含义“不可能”
备注(2):waiting outside为动态动词现在分词表示事件含义作后置定语修饰前面代词anyone,相当于进行体的定语从句who is waiting outside作后置定语修饰前面复合不定代词“anyone”
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