a. If only he didn’t drive so fast! ( =I wish he didn’t drive so fast.)

　　 　　b. If only he had taken the doctor’s advice. ( =I wish he had taken the doctor’s advice.)

　　 　　c. If only the rain would stop! ( =I wish the rain would stop.)

　　 　　a. It is time we got up.

2.在动词suggest (建议), advise (建议), demand (要求), require (要求), order (命令), insist (坚持)后的宾语从句中, 谓语动词常用“( should )+动词原形”的虚拟语气形式

　　　　 a. I suggested that we should go there at once.

　　 　　b. I demand that he should answer me at once.

　　 　　c. The doctor insisted that the patient should stay in bed for two weeks.

　　 　　d. The officer ordered that the soldiers should stop playing.

与名词suggestion建议 / advice 建议 / demand要求 / request要求 / order命令有关的从句(包括同位语从句和表语从句等)中的谓语也用 “( should ) +动词原形”

　　　　 a. The black people made a strong demand that the government ( should ) take steps to change the unfair situation.

　　　　 b. Their demand is that the government should take steps to change the unfair situation.

　　 　　c. I was Bill’s suggestion that everybody should have a map.

　　 　　d. His suggestion was that everybody should have a map.

1.在wish的宾语从句中, 通常表示不可能实现或没有实现的愿望, 常用虚拟语气

　　 ①.wish的宾语从句用过去式, 表示现在或将来没有实现或不可能实现的愿望

　　　　 　a. I wish I knew the result of the match now.

　　　　 　b. I wish it were spring here all the year round.

　　　　 　c. I wish I could help you.

　　　　 　d. I wish I were young.

　 　②.wish的宾语从句用过去完成式, 表示过去没有实现或不可能实现的愿望

　　　　 　a. We wish we had got the film tickets last night.

　　　　 　b. I wish you I had met him yesterday.

　 　③.wish的宾语从句若用would, 则一般表示请求, 对现状不满或希望未来有所改变

　　　　 　a. I wish the prices would come down.

　　　　 　b. I wish you would help me.

　　　　 　c. I wish he would be more careful.

　　　　 　d. We wish you would spend the holiday with us.

如果表示说话人的看法, 想法或意见, 在句型 “It is / was + adj. + that从句”中, 主语从句中可用虚拟语气. 主语从句中谓语动词用should do表示现在或将来情况, 用should have done表示过去情况

　 　　　a. It is necessary that you should clean the lab before you left.

　 　　　b. It is important that you should take the doctor’s advice.

　 　　　c. It was very strange that he should have left without say goodbye.

在此类复合句中, 若表示与事实相反, 可用虚拟语气形式. 主从句的谓语动词形式与非真实条件句相同

　　　　 a. Even if I were rich, I would work.

2.表示与过去事实相反的情况, as if / though从句谓语用过去完成式

　　　 　　a. The machines operated as if it had been repaired.

1.表示与现在事实相反或对相在情况有所怀疑, as if / though从句谓语用过去式

　　　 　　a. He speaks English so well as if she had studied English in England.

　 　　b. She looked as if she were ill.

4.假设的条件不以条件从句, 而以其他方式如介词短语、从句等表达出来, 这种句子称为含蓄条件句

　　 　　a. What would you do with a million dollars?

　　 　　b. Without music, the world would be a dull place.

　　 c. We could have done better with more money.

　　 d. He would have given you more help, but he has been so busy.

3.主从句时间不一致时, 主从句谓语动词的形式取决于要表示的具体时间

　　 　　a. You would speak English well if you had practised speaking it every day.

　　　　 b. If she hadn’t trained so hard, she wouldn’t be able to run so fast.