fail to do sth 做某事失败 ; 未能做某事 ; 没做成某事

fail in doing sth 做某事失败 ; 没能做到 ; 干…失败

not fail to do sth 一定能够某事 ; 务必做某事 ; 一定能做某事

fail in sth 作某事失败

to fail to do sth 不能作某事

can't fail to do sth 不能不做某事

fail to consider sth 忽略或未考虑某事物

sb fail to do sth 某人没能做某事