I worked for a foreign company when I was in Shanghai. 当我在上海时,我为一家外国企业工作。
注:when也可以作并列连词,表示一个动词正在进行的时候,突然间发生了另外一件事。eg.
I was fishing by the river,when someone called for help.
我正在河边钓鱼,就在那时有人求救。
We were working in the chemistry lab,when the lights went out.
我们正在化学实验室工作,突然灯都熄灭了。
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2. before 意为在之前,引导时间状语从句时,表示主句的动作发生在从句的动作之前。例如:
We cleaned the classroom before we left school yesterday.昨天离开学校之前,我们打扫了教室。
He had been a cook before he went to college . 他上大学前曾当过厨师。
after 意为在之后,引导时间状语从句时,表示主句的动作发生在从句的动作之后。例如:
After you use plastic bags,you mustn't throw them about. 你(们)用过了塑料袋之后,不准到处乱扔。
He called me after he had finished his work. 他在工作完之后给我打了个电话。
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