还有第二个动词用ING形式的,如 finish / keep / enjoy doing sth。举个例子看看。
追答He has finished doing his homework.
She always keeps smiling .
The boys enjoy playing basketball .
1、这类是属于什么句子。
2、没有说第二个动词前得加TO呀,那怎么理解第二个动词前加TO的句型。
1 简单句呀(不定式作宾语补足语)
2 有些动词后的不定式一定要带to,如 ask/ tell sb to do sth