问题描述:
be+过去分词的用法
This problem (should)be settled as soon as possible中是用be(课本上说should 可以省略) ,the house was cleaned为什么不用be?而是用was?第一句中的be 为什么不用is
This problem (should)be settled as soon as possible中是用be(课本上说should 可以省略) ,the house was cleaned为什么不用be?而是用was?第一句中的be 为什么不用is
问题解答:
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