fail这个单词的意思用法词组例句关联词

fail [feil]
vi.失败,没做成某事,表现欠佳,用完,衰退
vt.辜负,放弃,缺少,不及格
n.不及格,没做成
例句和用法：
1.Several banks failed during the depression.
有几家银行在不景气时期倒闭了.
2.He never fails to write to his mother every week.
他从来没有忘记每周给母亲写信.
3.He got a fail in history and passes in other subjects.
他历史考试不及格,其他科目都通过了.
4.I fail to see why you find it so amusing.
我不明白你们为什么对这件事感到如此好笑.
5.I tried to fix the equipment but I failed.
我想把机器修理好,但是失败了.