fail

　　If you dont work hard, you may fail. 此句中fail意為失敗;不及格,沒有通過考試。fail還有其它用法。如:

　　① He never fails to write to his mother every week.

　　(fail意為忘記、忽視或未能做某事。)

　　② She has been failing in health.

　　(fail in意為(健康狀況)衰退。)

　　③ His friends failed him when he most needed them.

　　(fail意為使失望, 辜負。)

　　④ I had three passes and one fail.

　　(fail用作名詞,意為考試不及格。)

　　⑤ Ill be there at two oclock without fail.

　　(without fail意為肯定,一定,必定。)