英语四级语法备战-should用法详解
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           三 . should 作为情态动词,可以用在条件状语从句中,表示语气较强的假设,译作“万一”、“竟然”,这时也可将 should 置于从句之首,即将 should 放在主语前面,而省略从属连词 if .例如:

      If you should fail to come, ask Mrs Chen to work in your place. (= Should you fail to come, ask Mrs Chen to work in your place. ) 万一你来不了,就叫陈夫人代替你。

      If anyone should come, say I am not at home. (= Should anyone come, say I am not at home. ) 万一有人来访,就说我不在家。

      If it should rain tomorrow, I wouldn't go. (= Should it rain tomorrow, I wouldn't go.)

      万一明天天下雨,我就不去了。

      四 . should 作为情态动词,可以表示谦逊、客气、委婉之意,译为“可……”、“倒……”。例如:

      I should say that it would be better to try it again.

      我倒是认为最好再试一试。

      You are mistaken, I should say. 据我看,你搞错了。

      He should expect their basketball team to win the match.

      他倒是希望他们的篮球队赢得这场比赛的胜利。

      Should you like some tea ? 你可喜欢喝茶?

      五 . should 作为情态动词,可以用来表示意外、惊喜或者在说话人看来是不可思议的。尤其在以 why, who, how 等开头的修辞疑问句或某些感叹句中常常译为“竟会”、“居然”。例如:

      How should I know it ? 我怎么会知道这件事?

      Why should you be so late today ? 你今天怎么来得这么晚?

      When I went out, whom should I meet but my old friend Xiao Li ! 当我出去时,想不到竟会碰见我的老朋友小李!

      I don't see any reason why he shouldn't be happy.

      我不明白为什么他居然不愉快。

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