Question

5．多数人认为中学生不应花太多时间玩电脑，否则，不仅损害视力而且有害健康．
Most of the peopledon't think middle school students should spend too much time playing computer games．Otherwise，it's bad not only for eyesight but also for health．

Answer 1

分析 don't think middle school students should spend too much time  playing．

解答 答案：don't think middle school students should spend too much time  playing．结合句意表达的是客观事实用一般现在时，表示认为用think，后加宾语从句，从句表达的是中学生不应花太多时间玩电脑，主语 middle school students，应该should，后加not构成否定，故should not，花时间做某事spend+时间+doing sth，too much太多，修饰不可数名词time，玩电脑play computer games，故从句 students should not spend too much time  playing，此时将从句的否定转移到主句，主句主语Most of the people复数，借助于do构成否定，故答案是don't think middle school students should spend too much time  playing．

点评 将think，believe，suppose，expect，fancy，imagine等动词后面宾语从句的否定词转移到主句中，即主句的谓语动词用否定式，而从句的谓语动词用肯定式．
　 I don't think I know you．我想我并不认识你．
　 I don't believe he will come．我相信他不回来．
注意：若谓语动词为hope，宾语从句中的否定词不能转移．
　 I hope you weren't ill．我想你没有生病吧．