You can tell him what you think of him.

你可以把你对他的意见告诉他。

youdao

Similarly, if someone buys something and then asks for your opinion, there is no need to tell him that you think he wasted his money. The truth would only have been helpful before the purchase.

同样地，如果有人买了东西，问你有何看法时，你就没必要告诉他你认为他是在浪费钱，因为这样的实话只有在买东西之前有帮助。

youdao

You tell him that you think that he'd be a fine COO some day and that he should work to develop a few more skills.

你会告诉他你认为将来某一天他会成为一名合格的首席运营官的，以及他还需要掌握的几项技能。

youdao

If you don't like the site and think UFO study is malarkey, don't flame its Web master and tell him I sent you.

CNN: The Internet: the final frontier for space watchers