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are were
acbc
i demanded he (should ) answer me immediately.
在主語從句在的應用。
1. it is necessary(important, natural, strange, etc.) + that 句。
2. it was a pity (a shame, no wonder, etc.)that +that 句。
3. it will be desired(suggested, decided, ordered, requested, proposed, etc.) that +句。
用（should）+do
bcb
在表語從句，同位語從句中的應用。
表示建議、要求和命令對應的名詞后面跟表語從句或同位語從句時，從句通常用虛擬語氣（should）+ do。
dba
my suggestion is that you should practice speaking english as often as possible.
在狀語從句中的應用。
even if/even though, as if/as though 引導狀語從句時，如表示與事實相反時用虛擬語氣。
she talked about the film as if she had seen it before.
acc
mr green spoke slowly so that/in order that he could make himself heard clearly by his students.
四、 虛擬語氣的幾個句式：
wish句式：
wish that +句子。“但愿……就好了”。與現在事實相反，謂語動詞用過去式、be（were）; 與過去事實相反，用had done; 與將來事實相反，用would + do.
cb
if only /only if 句式：
if only 通常要用虛擬語氣。而only if “只有……才……”，放在句首，用部分倒裝。
d
it’s (high ) time that……, would rather that……句式：
it’s time that……, 通常用過去式、be（were）,或用should +do。
would rather that……與現在事實相反，謂語動詞用過去式,be(were)；與過去事實相反，用had done; 與將來事實相反，用過去式。
dabc
含蓄句式：
but for/otherwise/or/without等引導短語相當于if 引導的條件狀語從句，句子使用相應的動詞形式。
adb