could/kʊd/

v.

➊ the past tense of “can”

➋ used to say sth is possible or may be true

➌ used to make a polite request or suggestion

➍ used to say that sth was possible, but did not actually happen

➎ used to express your wish to do sth that is not possible

v. [M]

➊ can的过去式：She said she could lend me her bike. 她说她可以把自行车借给我。

➋ 可能：You could be right. 你有可能是对的。

➌ 可以…：[could you/I ...?] Could you pass me the book? 你可以把那本书递给我吗？

◇You could ask for help. 你不妨求助。

➍ [could have done sth] 本来可以：You could have told me earlier! 你本可以早点告诉我的！

➎ [用于表达愿望] 会，可以：I wish I could fly! 要是我会飞就好了！

音组-ould/-ʊd/

could; should; would

常犯错误

✗ After treatment he could return to work.

✓ After treatment he was able to return to work. 经过治疗后，他返回了工作岗位。