Please give my best regards to him.

请代我向他请安问好。

《新英汉大辞典》

Please give my best regards to Mr. Smith when you see him .

当你见到史密斯先生时请替我向他问候。

youdao

Please give my best regards to Mr. Smith when you see him .

当你见到史密斯先生时请替我向他问候。

youdao