He keeps saying yes.

他一直说好的。

youdao

I was a bit nervous saying yes because I'm far from a professional.

我说“是”的时候有点紧张，因为我和专业人士还差很远。

youdao

My friends think I'm nuts for saying yes.

朋友们认为我答应是疯了。

《牛津词典》

He says Japan has had a history of saying "yes" to U.S.demands.

VOA: standard.2009.11.11

So basically we're saying yes, we can go from point a to point c without ever going through point b.

所以我们说的是我们可以从,ａ点不经过ｂ点而到达ｃ点。

麻省理工公开课 - 化学原理课程节选

It's usually best to respond in a complete sentence rather than saying yes or no which can be ambiguous.

一般来说，回答最好是完整的句子，而不是简单的模棱两可的“是”或“不是”。

Do you mind 课堂 - SpeakingMax英语口语达人

Only independents are a little squidgy, with 46% saying yes and 51% saying no.

FORBES: Voters to President and Congress: Get It Done

He keeps saying yes in the same spirit of those who donate, he said.

WSJ: Overseer of US victim funds says work wrenching

And his advisers were all over the airwaves yesterday saying yes, of course, the administration will listen to anything.

NPR: The Issue of Iraq Policy Change Takes Hold in Washington