doing共184篇 todo和doing放句首的区别to do放句首为动词不定式,用法和doing类似,多用来后边常说的事... enough to do和doing的区别enough to do和doing不能进行比较,因为enough后面不能加doing,... study to do还是study doing都可以,具体看实际语意。study to do和study doing的用法都是正... have great fun to do还是doinghave great fun doing sth。这里省略了in,正确的表达是have fun... have problem doing还是problems英语中常用短语have+problems+doing来表示做某事有困难,而不是用... 上一页 下一页