Much of what you say is true.

你的话有许多是对的。

youdao

Much of what you say is true.

你大部分的话是真的。

youdao

What you say is true in a sense.

你所说的在某种意义上是对的。

youdao

This is what distinguishes, you might say, the true man, the real man, from the slave.

这区分出，实人、,真人、,有别于奴隶。

耶鲁公开课 - 政治哲学导论课程节选

And I'm afraid what you say is true.

BBC: News Online

As for SEO: what you say is likely true: lots of so-called SEO experts do very little, or do it for a short period, or actually hurt you by doing SEO in a way that annoys Google and gets you penalized.

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Instead, say what IS true, what IS positive, what IS important to you.

FORBES: "I Am Not A Crook" -Media Training