很口头的说法: Say hello to XXX for me.
书面的,正式的: Please send my regards to XXX
Please send my best regards/wishes to **.
Please say hi to **.
Please remember me to **.
Please give my regards to sb; Remember me to sb;
Please 请
greet 问好
XX 某某
on my behalf 代我
Please greet XX on my behalf.
please say hello to ## for me