情态动词有一定的意义，表示人的看法和态度，不表示动作或状态。当间接引语中使用情态动词时需要考虑情态动词的时态变化。

‬转述动词是过去时的情态动词变化

• ‬ can ~ could

"I can go."

He said he could go.

• may ~ might / may

"I may go."

He said he might go.

• must ~ had to

"I must go."

He said he had to go.

• have to ~ had to

"I have to go."

He said he had to go.

• will~ would

"I will go."

He said he would go.

• am/is/are going to ~ was/were going to

"I am goling to go."

He said he was going to go.

‬在过去时下不会变化的情态动词

• should ~ should

"I should go"

He said he should go.

• ought to ~ ought to

"I ought to go."

He said he ought to go.

• ‬ might ~ might

"I might go."

He said he might go.

‬练习

用括号中的情态动词的过去时，补全下面的对话。

A:"Alex can't come at night."

B:"Are you sure,I heard he ( can )____come night."

ans:could.

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