once.

　　⑥It's high time we should_take/took (take) action to protect the environment.

　　二、英语口语

　　1．跟熟人交谈时用下列表达方式可以使"建议"听上去不生硬，具有试探性。

　　(1)虚拟语气表示委婉、客气的语气，常用句型"If I were you, I'd＋do ..."

　　If I were you, I would accept his advice.

　　如果我是你，我会接受他的忠告。

　　(2)句型I think you should/ought to do ...，表示"我认为你应该做......，"语气稍强。

　　I think you ought to tell your husband you're pregnant.

　　我想你应该告诉你丈夫你怀孕了。

　　2．用下列方式可以强硬地对某人批评、责怪或提出建议，使用这种方式常具有权威性。

　　(1)I'd rather (that)＋一般过去时/过去完成时 ...

　　I'd rather she set out to do the work now.

　　我宁愿她现在就着手做这项工作。

　　(2)You'd better＋do ...

　　You'd better give up smoking or you'll end in hospital.

　　你最好戒烟，否则你的结局就是住院。

　　[即时演练2]　完成句子

　　①(2016·北京高考改编)Why didn't you tell me about your trouble last week? If_you_had_told_me (如果你告诉了我), I could have helped.

　　②I think you should/ought_to_give_up_smoking (应该戒烟)．

　　③If_I_were_you (如果我是你), I would go abroad for further study.

　　④(江苏高考改编)George is going to talk about the geography of his country, but I'd rather he focused_more_on (更多地集中于) its culture.

　　⑤If you are planning to spend your money having fun this week, you had_better_forget (最好忘记) it - you've got some big bills coming.

　　Ⅰ.用所给词的适当形式填空

　　1．He insisted that he was (be) right, and he insisted that his plan (should)_be_carried (carry) out at once.

　　2．If I were (be) you, I would_accept (accept)the job at once.

　　3．I'd rather you posted (post) the letter right away.

　　4．I suggest we (should)_visit (visit) the Metropolitan Museum of Art first.

5．She demanded that he (should)_finish (finish) the work within an hour.