例題分析：

15.It is politely requested by the hotel management that radios ______ after 11 o'clock at night.

A. were not played 　　B. not be played

C. not to play 　　　　D. did not play

全句意思是：“旅館管理部門懇請客人晚上11點后不要打開收音機”。句中的謂語動詞request（請求）所引出的從句應當用虛擬語氣，即動詞原形或“should+動詞原形”。本句的主語從句中，主語radio是謂語動詞play 的客體，謂語應當用被動語態。所以，答案是C） not be played。在上述這類句子中不能用動詞過去時形式表示虛擬語氣，所以A）不正確。選項B） not to play是動詞帶to的不定式，不能在句中作謂語。選項D）did not play也是動詞play的過去時形式，同樣不能在本句中作為虛擬語氣來使用。而且，它是主動語態形式，而本題要用被動語態。

練習：

16）。 The chairman requested that .

[A]the members studied more carefully the problem

[B]the problem was more carefulnessly studied

[C]with more carefulness the problem could be studied

[D]the members study the problem more carefully

17）。 The committee recommends that the matter at the next meeting .

[A]would be discussed

[B]will be discussed

[C]be discussed

[D]may be discussed

18）。 The doctor insisted that his patient .

[A]that he not work too hard for three months

[B]take it easy for three months

[C]taking it easy inside of three months

[D]to take some vacations for three months

在expect, believe, think, suspect等動詞的否定或疑問形式后的賓語從句中的虛擬語氣

在expect, believe, think, suspect等動詞的否定或疑問形式后的賓語從句中，我們經常用“should+動詞原形（或完成形式）”，表示驚奇，懷疑，不滿等。

I never thought that he should be such a brave young soldier.

我們從來沒想到他是個如此勇敢的小戰士。

練習：

1） that the time will soon be ripe for intervention in Iran，they would be faced by a large army?

[A]It is believed

[B]Should they believe

[C]They would believe

[D]If they would believe

2） I think it advisable that he for Tokyo soon.

[A]will leave

[B]may leave

[C]leave

[D]leaves