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2. 虛擬語氣用于主語從句

(1) 在句型"It is important (necessary， strange， essential ...) that .... "中，that 后面的從句中的謂語動詞用"(should)+ 動詞原形"。如：

It’s necessary that you should review your lessons before the examination.

(2) 在句型"It is suggested (requested， proposed， ordered ...) that ... "中，that 后面的從句中的謂語動詞用"(should)+ 動詞原形"。如：

It’s suggested that we (should) put on a short play at the party.

3. 虛擬語氣用于表語從句或同位語從句

advice， idea， order， demand， plan， proposal， suggestion， request等名詞后的表語從句和同位語從句中用虛擬語氣，謂語動詞用"(should)+ 動詞原形"。如：

His suggestion that we (should) go fishing is wonderful.

My idea is that we (should) get more people to attend the conference.

4. 以as if / as though引導(dǎo)的方式狀語從句或表語從句，有時用虛擬語氣

從句表示與現(xiàn)在事實相反，謂語動詞用一般過去時；表示與過去事實相反，用had +過去分詞；表示將來的可能性不大，用would (might， could) +動詞原形。如：

He speaks as if he knew everything about the accident.

The two strangers were talking warmly as though they had been friends for years.

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