Certain people might disagree with this.

某些人对这事可能不会赞同。

There will be certain people who'll say "I told you so!"

会有某些人说，“我告诉过你了！”

The determinist doctrines in question maintained that certain people were born to be slaves.

上述的决定论信条坚信某些人生来就是奴隶。

Expressing your anger can be appropriate with certain people at certain times.

在某些时候对某些人表达愤怒是可以的。

Or do you only tell certain people?

或者你是不是只是告诉了某些人？