他说他愿意用英语怎么说

你可以说：
"He said he is willing to use English."
这句话的来源是来自于英语中的一个句型：主语 + 谓语 + 宾语。在这句话中，"He" 是主语，"said" 是谓语，"he is willing to use English" 是宾语。
举个例子：
例句 1:
"I said I would help you with your homework."
我说过我会帮你做作业。
例句 2:
"She told me she was feeling sick."
她告诉我她感觉不舒服。
例句 3:
"He mentioned that he had a meeting at 10 o'clock."
他提到他有一个10点的会议。