1.下列说法中正确的是：

A.气体的温度升高时，分子的热运动变得剧烈，分子的平均动能增大，撞击器壁时对器壁的作用力增大，从而气体的压强一定增大

B.气体体积变小时，单位体积的分子数增多，单位时间内打到器壁单位面积上的分子数增多，从而气体的压强一定增大

C.压缩一定量的气体，气体的内能一定增加

D.分子a从远处趋近固定不动的分子b，当a到达受b的作用力为零处时，a的动能一定最大

　　　　 a. I would rather he came next Saturday.

　　　　 b. I would prefer you had seen the film yesterday.

　　 　　c. I would rather that he painted the house blue.

　　 　　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.