It’s time that something was done about the traffic problem downtown.
It is high time that we put an end to this discussion.現(xiàn)在是我們該結(jié)束講座的時候了。
(5)as, 或者whether…or…謂語多用be的原形，引導讓步虛擬從句，這種用法通常采用倒裝結(jié)構(gòu)：
Church as we use the word refers to all religious institutions, be they Christian, Islamivc, Buddhist, Jewish, and so on.
The business of each day, be it selling goods or shipping them, went quite smoothly.
(6)由連接詞in case, so that ,unless, lest ,for fear that引起的狀語從句中，謂語動詞要用虛擬形式，即should(might, would)+動詞原形，例如：
She put a blanket over the baby for fear that he should catch cold. 她在那個嬰兒身上蓋上了毯子以免他著涼。
The bad man was put in the soft-padded cell lest he injure himself.
(7) if it were not for…與現(xiàn)在事實相反， if it had not been for與過去事實相反，兩個都相當于but for：
If it had not been for his help(=but for his help),we would not have succeeded.
(8) 虛擬語氣用于as if(though)引起的方式狀語從句和表語從句中，其動詞形式與wish賓語從句的形式相同。例如：She often laughs spontaneously, and her good humor breaks out as brightly as if it were a part of the sunshine above.她常常發(fā)出發(fā)自內(nèi)心的微笑gydjdsj.org.cn，而且她那美好的情緒像天上一道明亮的陽光一樣，常常流露出來。
They talked as if they had been friends for years.他們交談著，就好像他們是我年的老朋友一樣。
She looks as if she would cry.她看起來好像要哭了。
(9)其它各種句型, as though, suppose, had rather, supposing, if only等等
If I were in a movie, then it would be about time that I buried my head in my hands for a cry.
