?做某事失败

... turn out 证明是；结果是；后来是 fail to do sth 没能做某事；做某事失败 break down 打倒；砸破；分解；划分；出故障；垮掉 ...

?未能做某事

fail to do sth. 做某事没有成功；未能做某事 He never fails to write to his mother every week. 他每周都给母亲写信。

?未能做

... fade away 逐渐消失 fail to do sth. 未能做 fall in between 介于两者之间 ...

?没做成某事

... fail in doing sth 做某事失败 fail to do sth 没做成某事 fall asleep 入睡 ...