2．当人们想要表达建议、命令或要求时，从句的谓语动词需用虚拟语气，其形式为"(should＋)动词原形"。这些从句可以是宾语从句、主语从句、同位语从句或表语从句。

　　Our teacher demanded that Mary (should) finish her homework within a week.

　　我们老师要求玛丽在一周内完成作业。

　　His suggestion is that we (should) do our homework more carefully.

　　他的建议就是我们的工作要更细心一些。

　　[名师点津]　"一、二、三、四"记虚拟：一个"坚持"(insist)；两个"命令"(order, command)；三条"建议"(advise, suggest, propose)；四项"要求"(demand, require, request, ask)。

　　(1)suggest作"建议"讲，宾语从句用虚拟语气；若作"暗示，表明"讲，则用陈述语气。

　　(2)insist作"坚持认为、坚持说"讲时，宾语从句不用虚拟语气。只有当insist作"坚持(要求)""坚持(应该)"讲时宾语从句才用虚拟语气。

　　The Arab insisted that he had never seen the camel and that he (should) not be punished for its lost.

　　那个阿拉伯人坚持说他从未见过那头骆驼，并且坚持认为自己不能因为骆驼的丢失而受到惩罚。

　　Jane's pale face suggested that she was ill, and her father suggested that she (should) have a medical examination.

　　简苍白的脸色表明她生病了，她父亲建议她做一下医学检查。

　　3．It's (high/about) time that句式中，that从句中的谓语动词常用过去式或should do, should不能省略。

　　It's high time that I went/should go to pick up my daughter at school.

　　我该去学校接我的女儿了。

　　[即时演练1]　 用所给词的适当形式填空

　　①(陕西高考改编)My mom suggests that we (should)_eat (eat) out for a change this weekend.

　　②(浙江高考改编)Eye doctors recommend that a child's first eye exam (should)_be (be) at the age of six months old.

　　③(辽宁高考改编)Jack is a great talker. It's high time that he did/should_do (do) something instead of just talking.

　　④They are suggesting that a new school (should)_be_built (build) in this area.

⑤The young man insisted that he did (do) nothing wrong and should be_set (set) free at