(一): We have heard much about your company. 我们久仰贵公司的大名。

A: We have heard much about your company.

甲：我们久仰贵公司的大名。
B: Thanks for the kind words.
乙：谢谢。
I have heard a lot about...
I've heard so much about…
I've heard a great deal about.. ?
I've long heard about…

(二): I'll surely remember you and your invitation to him. 我一定向他转达您的问候和邀请。
A: I'll surely remember you and your invitation to him.
甲：我一定向他转达您的问候和邀请。
B: I appreciate it.
乙：非常感谢。
请转达我们的问候：
Please convey my greetings.

请转达我的问候。
Please send my greetings to him.

请向他转达我的问候