1、wish后的賓語從句：
與現(xiàn)在愿望不一致 主語＋過去時；I wish I were you.
與過去愿望不一致 主語＋had＋過去分詞；I wish I had visited the white House when I was in the states.
與未來愿望不一致 主語＋would（could）＋原形。I wish I could meet you tomorrow at the party.
2、It’s time句型：當It’s time后用that從句時應該為：主語＋should＋原形 或 主語＋過去時，例如：
It’s time that you went to school. 或It’s time that you should go to school.
3、If only引起的感嘆句相當于“How I wish＋賓語從句”
If only he could come！ 他要能來就好了。
If only I had known the answer！ 我要早知答案就好了。
4、would rather， as if（though）引導的句子也需使用虛擬，表示過去的情況用過去完成時，表示現(xiàn)在與將來的情況用過去時，如：
I’d rather you posted the letter right away.
I’d rather you had returned the book yesterday.
She loves the children as if they were hers.
Alan talked about Rome as if he had been there.
5、without， but， but for， otherwise引起的短語或句子常暗含著含蓄條件。
Without you， I would never know him.
But for your cooperation， we wouldn’t have done the work so well. = If it were not for your cooperation， we we wouldn’t have done the work so well.
注： without / but for … = If it weren’t not for…/ If it hadn’t been for …。， sb …。。
But that she was afraid， she would have said no.
I would be most glad to help you， but I’ am busy now.
I am busy now; otherwise I would do you the favor！