3.wheter,if 这两个连接词都表示 是否、是不是 之意。
whether: 是否、无论、不管是否 它可以表示两种不同的条件或情况,意为不论还是,可以引导间接引语. 也可表示疑惑,意思都是 是否。在下列情况下,不能用if代替:引导不定式: 引导不定式: 作介词宾语: 在名词之后引导同位语: 引导主语从句并置于句首: 与or not连用。常用短语:whetheror 不论还是;whether or not是否;whether by accident or design 不知是无意还是有意。
This is certainly the case, but whether it is a defect or not I dont quite know. 这肯定是事实,但它是否是一个缺点,我真的不知道。
if: 是否 一般用在口语中,通常只能引导宾语从句,可以和whether 交换使用。常用在wonder 等动词之后。
I wonder if his action will be in agreement with his word thistime. 我不知道他这次是否能言行一致。
26. till ,until都直到 之意。
till:多用于口语。在肯定句中,与表示持续动作的动词连用,表示某个动作或状态延续 到为止: 在否定句中,一般不能置于句首。
He didnt join the army till th civil war broke out. 直到战争爆发,他才参了军。
until:比till更为正式,可以置于句首,更适用于引导较长的从句或强调句中。常用短语:not until 直到才。
He did not go to bed until he had made sure that nothing was wrong wilh the pipes. 直到他确信水管没毛病了才去睡觉。
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