问题描述：
请大家帮忙分析这个句子
They will come back after four days .句中的after four days 是介词短语做状语吗?
还有这个句子：
To do such a job we need a better knowledge.
书上说To do such a job是主语,那we在句中充当什么成份?
They will come back after four days .句中的after four days 是介词短语做状语吗?
还有这个句子：
To do such a job we need a better knowledge.
书上说To do such a job是主语,那we在句中充当什么成份?
问题解答：
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