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1、 It has never been explainedwhy university students seemto enjoy practical jokes more than anyone else.
   谁也弄不清为什么大学生好像比任何人都更喜欢恶作剧。大学生擅长一种特殊的恶作剧——戏弄人。
    可以用来说明一种比较奇怪的现象的开头。

2、 Sure enough, a policeman arrived on the scene and politely asked the workmen togo away.
   果然,警察来了,并礼貌地请工人离开此地

3、 The workmen told him to do as he pleased and the policeman telephoned forhelp.
    工人说,悉听尊便。警察去打电话叫人。

4、 Only when he saw that the man was actually telephoning the police did he realize that they had all been the victims ofhoax.
当他看到那个工人真的是给警察挂电话,才恍然大悟,原来他们都成一场骗局的受害者。
倒装句。。助词要提前。。更加强调一种恍然大悟的感觉。