26. What do you want to do with that five thousand dollars? (P)

　 I've been writing this book these five years.　 (P)

　 [解析] that, this, those, these 这四个指示代词都可以用在那些表示一段时间、一笔钱数的名词前面与之连用。因为把钱数和一段时间可以当作一个整体看。

25. Who's this speaking? 　That’s Mary. (Ñ)

　　 Who's that speaking?　 This's Mary. (P)

　 [解析]在谈话和电话用语中this指自己，而that指对方。

24.--- We'll go to visit the Science and Technology Museum this afternoon. That will be interesting.　　　　 (Ñ)

　 ---We'll go to visit the Science and Technology Museum this　 afternoon. This will be interesting.　　　 (P)

　 [解析] 在讲述过去事时用that，而讲述将要发生的事时用this。如："We can go to see a film this weekend."

　"That's a good idea."这里用that是指前面提到的那件事。

23. I like these pink. Which do you prefer? (Ñ)

　　 I like these pink ones. Which do you prefer? (P)

　　 [解析] 指示代词有this, that(指单数)， those, these (指复数)，而that, those指相对远处的东西，而this, these为近处的东西，在美语中ones有时被省略，如：I prefer these books to those.但如其后接形容词了则ones就不能省略了。下句中的days也不能省略。Work was difficult in those days.

22. Help yourself for the fruit.　　　　　　　 (Ñ)

　　 Help yourself to the fruit.　　　　　　　　 (P)

　 [解析] 这里的 to 是习惯用法。要注意与反身代词连用的动词，如：

　　　 enjoy yourself(玩得开心)

　　　 make yourself at home(不要拘束)

　　　 lose oneself(迷路)

　　　 come to oneself(苏醒)

　　　 seat yourself(请坐)

21.You must all look after yourself during your trip. (Ñ)

　 You must all look after yourselves during your trip. (P)

[解析]要注意反身代词与其名词的一致性。因这里有 all, 所以 you 应看做你们。

20. Please bring your son with yourself. (Ñ)

　　 Please bring your son with you.　　 (P)

　 [解析] 要注意介词宾语不要用反身代词。

19. One should not live for oneself alone. (Ñ)

　　 One should not live for himself alone. (P)

　　 [解析] 英语中one的反身代词应为oneself，而现代英语中却常常用himself。

18. Take care of ourselves. (Ñ)

Take care of yourselves (yourself) (P)

　 [解析] 祈使句的主语应作you看待。

17.Myself did it yesterday. (Ñ)

　　 I myself did it yesterday. (P)

　　 [ 解析] 反身代词不可作主语，但可作主语同位语。