when, while, as的用法區(qū)別necessary的用法cease doing/to do的區(qū)別even though和even if的用法區(qū)別every two與every second的區(qū)別a great deal of, a lot of, plenty of的區(qū)別advise的用法rather than的用法be to和be going to的區(qū)別引導從句時用its與whose的區(qū)別awake, wake, awaken, waken用法區(qū)別accept和accept of的區(qū)別介詞for用法大全few, little, a few, a little 的區(qū)別regret doing/to do的區(qū)別across 的用法write 與write about的區(qū)別“Way” 短語講解because的用法歸納another和the other 的區(qū)別