你要是遇到他，请代我向他问好。

In case you meet him, please give him my regards.

youdao

那么，请代我向他问好。

Well, say hello to him for me.

youdao

请代我向他问好。

Please say hello to him.

youdao

请代我向他请安问好。

Please give my best regards to him.

《新英汉大辞典》

你回家时请代我向他们问好。

Please give my best regards to them when you're home.

youdao

你回家时请代我向他们问好。

Please give my best regards to them when you're home.

youdao