He needs to spend time on his homework.其中的on可以改为in吗?因为我知道有spend time (in) doing sth.既然in后面可以跟动名词,那好像就可以跟名词的吧?
问题描述：
He needs to spend time on his homework.
其中的on可以改为in吗?
因为我知道有spend time (in) doing sth.既然in后面可以跟动名词,那好像就可以跟名词的吧?
答
in 后面必须跟动名司，并不能直接跟名词
spend in doing sth(in可省略）
所以你想把on改为in， 句子应该是
He needs to spend time in doing his homework
答
in 后面必须跟动名司，不能直接跟名词
答
He needs to spend time on his homework.==He needs to spend time( in) doing his homework