Just as [when] the two men were leaving, a message arrived. 就在这两个人要离开的时候,突然有了消息。
三、根据是否具有伴随变化来区分
若要表示主句动作伴随从句动作同时发展变化,有类似汉语随着的意思,英语习惯上要用as,而不用when或while。如:
The room grew colder as the fire burnt down. 随着炉火逐渐减弱,房间越来越冷。
As time goes by my memory seems to get worse. 随着时间的流逝,我的记忆力似乎越来越差。
注:若不是引导从句,而是引出一个短语,则用with,不用as。如:
With winter coming on, its time to buy warm clothes. 随着冬天到来,该买暖和衣裳了。
The shadows lengthened with the approach of sunset. 随着太阳下落,影子也逐渐伸长。
四、根据从句动作的规律性来区分
若暗示一种规律性,表示每当的时候,英语一般要用when。如:
Its cold when it snows. 下雪时天冷。
He smiles when you praise him. 你夸奖他时他总是笑笑。
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:
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