间接引语中的 must

在间接引语中，must 既可以用 had to 来代替，也可以保持原形不变。

1. His parents told him that he $\$left\{\begin{array}{l} must \\ had to \end{array}\right\} be in by ten that night. (CGEL) 他的父母告诉他那天晚上他必须10点以前到家。

2. “I must go.”→He said he must[ had to] go. (PEU) “我必须去。”他说他必须去。

3. He said he $\$left\{\begin{array}{l} must leave early. \\ had to leave early. (NCE,2,p.17) \end{array}\right. 他说他必须早走。

4. She said they must go early the next day. (LEG) 她说他们第二天必须早走。

5. He said that they must be hungry. 他说他们一定饿了。

据 L. G. Alexander 的解释, 在间接引语中使用 must 与使用 had to 在意义上是有区别的: He said he must leave early. (说此话时他尚未离开) 他说他必须早走。

He said he had to leave early. (说此话时他已离开) 他说他不得不早走。

此外,need, ought to, had better 本身没有过去时形式,因而它们在间接引语中仍保留其原有形式。

1. He warned me that I had better not say anything about that. (CGEL) 他警告我最好不要

对那件事说什么。

2. The doctor told him (that) he ought to slow down a bit. (LEG) 医生告诉他应该放慢一些节奏。

3. The boss said I needn't come the next day. (LEG) 老板说我第二天不必来了。