His mother did all she could to help him with his study可以改成His mother did all she could do to help him with his study吗?可以的话,句子成分有变化吗?不可以改的话,为什么?
问题描述：
His mother did all she could to help him with his study
可以改成His mother did all she could do to help him with his study吗?
可以的话,句子成分有变化吗?
不可以改的话,为什么?
答
His mother did all she could to help him with his study.
=His mother did all she could do to help him with his study.
=His mother did what she could (do) to help him with his study.
答
可以的，do是可以省略的。。。在这里应该是宾语。。。
答
我认为是可以改的.上一句本来就是省略了do.成分应该没有变化.