(二)引导状语从句的从属连词
(2)whether和if的区别:whether 和if 引导动词后的宾语从句时可互换,但下列情 况一般只能用whether而不能用if. ① 介词和discuss后。 ② 引导表语从句、同位语从句和主语从句。 ③ whether...or not时. ④ whether to do时. 例如: Whether the 2024 Olympic Games will be held in Beijing is not known yet. 2024年的奥运会是否会在北京举行还不知道。 Success depends on whether we make enough effort. 成功取决于我们是否做出了足够的努力。 Please tell us whether to go or stay here. 请告诉我们是走还是待在这里。
(二)引导状语从句的从属连词
1.引导时间状语从句的从属连词有: (1)表示“当……时候”或“每当”的时间连词:when, while, as等。例如:
Don’t talk while you’re eating. 吃饭时不要说话。 Vegetables are best when they are fresh. 蔬菜新鲜时最好吃。 He came just as I was leaving. 我正要走时他来了。
He replied that he was going by train. 他回答说他将坐火车去。 I wonder if it’s large enough. 我不知道它是否够大。 I worry about whether I hurt her feelings. 我为是否伤了她的 感情而担心。
3. 引导目的状语从句的从属连词:in order that, so that等。例如: He raised his voice so that everyone could hear. 他提高了嗓音,以便每个人 都能听见。 She repeated the instructions slowly in order that he should understand. 她把那些指示慢慢重复了一遍,以便让他听明白。