Do please forgive this tardy reply.

[laurinha88]

what "do" mean in here? Is that used to emphasize the main verb in a sentence?
like in "Do be careful"?

 

[emsr2d2]

what "do" mean in here? Is that used to emphasize the main verb in a sentence?
like in "Do be careful"?

Yes.

 

[Allen165]

NOT A TEACHER.

I'm not sure that's good English. I'd prefer "Please do forgive me for this tardy reply."

 

[emsr2d2]

I hear "Do please..." frequently.

Do please make yourself at home.
Do please help yourself to drinks from the bar.

I guess maybe there should be commas around the word "please".