| 释义 |
need not ： ought not to--688
这两个否定助动词同义，都作“不该”讲，但 need not 总是指没有必要的事情（参见词条 P.679 ），而 ought not to 则多半是指错误的事情。
例如：
We should wash the dishes, but we needn't dry them ， because they will dry themselves. 我们应该把这些碟子洗一洗，但不用擦干，因它们自己会晾干的。
We have left undone those things which we ought to have done, and we have done those things which we ought not to have done. 该做的事情没有做，而不该做的事倒做了。
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