n. 接近; 途径,方法
v. 靠近,接近,动
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五、根据主从句动作的先后顺序来区分
若主句与从句所表示的动作不是同时发生,而是有先后顺序时,一般要用when。如:
When he arrives he'll tell us all about the match. 等他到了,他会好好给我们讲讲那场比赛的情况。
When she had finished she waited as though for a reply. 她讲完之后等了等,仿佛是在等候回答似的。
六、根据是否具有“趁机”意味来区分
1. 若从句所表示的“当……的时候”具有“趁机”的意味,则通常用while。如:
Strike while the iron is hot. 趁热打铁。
I tried to slip the note to him while the teacher wasn't looking. 我想趁老师不注意时把条子偷偷递给他。
有时也用when。如:
He stole the money when no one was by. 他趁旁边无人时把钱偷走了。
The boy looks at her repeatedly when she's not looking. 那男孩趁她没看他的时候不断地盯着她看。
七、根据是否用作并列连词来区分
when可用作并列连词,表示“这时(突然)”;while也可以用作并列连词,表示“而”“却”(表示对比);但as则没有类似用法。如:
I was just about to go to bed when I heard a knock on the door. 我正要睡觉,听见有人敲门。
One person may like to spend his vacation at the seashore, while another may prefer the mountains. 一个人会喜欢在海滨度假,而另一个人会喜欢在山里度假。
八、根据所引出的省略句来区分
1. as和when之后均可直接跟一个名词,构成省略句;但是while一般不这样用。如:
As [When] a boy, he lived in Japan. 他小时候在日本。
As [When] still a student, he wrote a novel. 当他还是个学生的时候,他就写了一本小说。
2. when和while之后可接现在分词、介词短语、形容词等构成省略句,但as一般不这样用。如:
When [While] reading, he fell asleep. 他看书时睡着了。
When [While] in trouble, ask her for help. 遇到麻烦的时候你就去找她帮忙。
You must study hard while (you are) young, or you will regret when (you are) old. 你趁年轻时必须努力学习,不然到老了你会后悔的。
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