问题描述：
It is thoutful of you to play CDs for us 分析这个句子的成分,以及问一下,这里的is可以换用was么?
It is thoutful of you to play CDs for us
分析这个句子的成分,以及问一下,这里的is可以换用was么?
说明:像"It is important for you to exercise everyday"这个句子可以还原成"To exercise everyday is important for you"
那么最上面那句"It is thoutful of you to play CDs for us"可以如何还原呢?
注意:is可以换成was吗?
It is thoutful of you to play CDs for us
分析这个句子的成分,以及问一下,这里的is可以换用was么?
说明:像"It is important for you to exercise everyday"这个句子可以还原成"To exercise everyday is important for you"
那么最上面那句"It is thoutful of you to play CDs for us"可以如何还原呢?
注意:is可以换成was吗?
问题解答：
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