There might have been someone waiting outside.
可能曾有人在外面等候。
There must have been something blocking the pipe
管子肯定曾被什么东西堵住了。
There could have been someone crossing the road.
可能曾有人横穿马路。
【英语语法存在句知识点:there be与情态动词连用(2)】相关文章:
★ 状语从句知识点总结:It be…since /before /when…从句归纳
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