【例2】 One Friday, we were packing to leave for a weekend away _____my daughter heard cries for help.
A. after B. while C. since D. when
答案:D。
点拨:此题中就用了以上第①种句式,表示“某人正在做某事,这时突然……”,整句意为“某一个星期五,我们正在收拾行李准备外出度周末,这时我女儿突然听到呼救声”。
此外,when还可表“既然”之意。如:It was foolish of you to take a taxi when you could easily walk there in five minutes. 既然你五分钟之内能走到那儿,你还乘出租车,真是太傻了。
(2)while作为从属连词还可表示“虽然,尽管”之意。
【例3】______volleyball is her main focus, she’s also great at basketball.
A. Since B. Once C. Unless D. While
答案:D。
点拨:此题句意为 “虽然排球是她的主要项目,但她也擅长篮球”。其中while意为“虽然,尽管”。
2.till/until的两种句式
表二:till与until的区别
连词 | 意义 | 用法 | 从句谓语动词特点 |
till/until | 一直到……为止 | 主句和从句都用肯定形式 | 主句的动词为延续性动词 |
not…till/until | 直到……才 | 主句用否定式,从句用肯定式 | 主句的动词为非延续性动词 |
如:
I’ll stay here till/until the rain stops.
He didn’t go home till/until he finished his homework.
【例4】 If a lot of people say a film is not good, I won’t bother to see it, or I’ll wait ______ it comes out on DVD.
A. whether B. after C. though D. until
答案:D。
点拨:此题从句意看,应表示“如果许多人说某一部影片不好,我就不会费神去看了,或者我会等到DVD出来”。所以要用until表示“直到……”之意,故选D。
【注意】till 不可置于句首,而until可置于句首;not until置于句首时主句要倒装。如:Not until he came back did we know that he had been away for three weeks.
not until也可用在It is…that…的强调结构中,但这时要把not until一起提前,而且不需要倒装。如:She won’t go to bed until he returns home. 在强调结构中应是这样的:It is not until he returns home that she will go to bed.
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