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(3) 在though, although等引導的讓步狀語從句中，從句虛擬語氣結構為 should +動詞原形，主句結構不限。如：
Although / Though he should often be late, he is a good student. 盡管他經常遲到，他還是個好學生。
Although / Though he should be secretary, he must obey the rules. 盡管他是書記，他也必須遵守規定。
3. 方式狀語從句中的虛擬語氣
as if, as though 引導的方式狀語從句常用虛擬語氣。虛擬語氣的結構為：
|
表示所發生的時間 |
虛擬語氣結構 |
|
發生在主句動作之前 |
had + 過去分詞 |
|
與主句動作同時發生 |
過去時(be 用were ) |
|
發生在主句動作之后 |
would / could / might / should+原形動詞 |
例如：
They began to talk warmly as if they had known each other for long. 他們開始熱烈的談論起來就好像他們已相互認識很久了。
He coughed twice as if someone should come. 他咳嗽兩聲就好像有人要來了。
4. 原因狀語從句中的虛擬語氣
amazed, angry, annoyed, astonished, disappointed, frightened, happy, pleased, proud, sorry, surprised, upset 等后面的狀語從句中常用虛擬語氣。其虛擬語氣的結構為：
① should + 原形動詞(指現在或將來)。如：
He was angry that you should call him by name. 他很生氣，你竟然對他直呼其名。
I was astonished that he should not answer such an easy question. 我很驚訝他竟答不出如此簡單的問題。
② should + 完成式, 指過去。如：
I’m very sorry that you should have failed the exam. 我很遺憾，你這次考試竟然失敗了。
I was very surprised that Father should have known what I did yesterday. 我很吃驚，父親竟指導我昨天所作的事情(from m.52ysedu.com)。
三、賓語從句中的虛擬語氣
1．英語中，如：advise, ask, demand, desire, decide, insist(堅決要求) , order, propose, request, suggest(建議) 表示請求、要求、命令或建議等意義的動詞所接的賓語從句一般用虛擬語氣，其虛擬語氣的結構為：(should) + 原形動詞。如：
The teacher advised that we should make good use of every minute here. 老師勸我們要好好地利用在這兒的每一分鐘。
The Party asked that we should serve the people with our heart and soul. 黨要求我們要全心全意地為人民服務。
但是，當insist的意思為：堅決認為，堅持說；suggest的意思為：表明，暗含，暗示等時，賓語從句一般不用虛擬語氣。如：
Tom insisted that he hadn’t stolen the watch. 湯姆堅持說他沒有偷那塊手表。
His smile suggested that he had succeeded in this exam. 他的微笑表明他在考試中成功了。
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