Question

14．和我同齡的學生們常常懷疑花這么多時間做家庭作業是否值得．Students of my age often doubt if it is worth spending so much time doing homework．．

Answer 1

分析 Students of my age often doubt if it is worth spending so much time doing homework．

解答 答案：Students of my age often doubt if it is worth spending so much time doing homework．表達的是經常性的動作故用一般現在時，主語students，和我同齡of my age，doubt懷疑，故Students of my age often doubt，后加if（是否）引導的賓語從句，be worth doing sth值得做某事，花時間做某事spend+時間+doing sth，故答案是Students of my age often doubt if it is worth spending so much time doing homework．

點評 doubt+賓語從句
　　（1）在否定句和疑問句中，doubt后面接that引導的賓語從句． 例如：
　　I don"t doubt that he can finish the task on time．我相信他能按時完成任務． Do you doubt that she will succeed？你懷疑她會成功嗎？
　　（2）在肯定句中，doubt后面一般接whether或if引導的賓語從句． 例如：
　　I doubt whether they can swim across the river．我懷疑他們能否游過河去． He doubts if she will keep her word．他不敢肯定她是否會遵守諾言．