1。insist doing和insist on doing有什么不同么？还是没有insist doing这种说法的？ 2。It's unusual that David _____(come) here an hour ealier.答案是should come，为什么不是came，是虚拟语气么？但是应该怎么翻译这句话？ 3。teacher ban students_____(copy)home working. copying or from copying? 4.she devoted her whole life_(dovete)poor children in her country. devoting or to devoting? 5 the boy is considered _____(set)a good example to his classmates. to have set or having set? 请懂的朋友给我解释一下这几个题目好么？

insist on doing 绝对不会错跟往常不一样这次大卫应该提前一个小时来了。和虚拟语气无关，表示一种可能性。注意体味from copyingto devotingto have set

insist insist意为“坚持认为”时，其宾语从句的谓语动词用陈述语气；作“坚持要求”解时，其宾语从句的谓语动词要用虚拟语气，即“should＋动词原形”。insist后面不可接不定式作宾补，即不能说insist sb．to do sth．。另外，insist on后面的动词要用-ing形式。 [练习] 1．The old man insisted that I ＿＿＿＿ his wallet．In fact, I didn't． A．had taken B．should take C．would take D．took 2．The old man insisted that we ＿＿＿＿ early the next morning． A．had left B．would leave C．should leave D．left 3．He has always insisted on his ＿＿＿＿ Dr Turner instead of Mr Turner．(上海'92） A．been called B．called C．having called D．being called [答案]1—3 ACD [简析]1．本句中的insist意为“坚持认为”，且是过去时，故从句中用相应的过去完成时。2．本句中的insist意为“坚持要求”，故从句中应用虚拟语气。3．因insist on后的动词要用-ing形式，又因为本句的主语He和call之间是被动关系，所以只能选D。