Verb Tenses:
The present perfect tense of the verb "send" is "have sent," not "have send."
“Did you receive my message” is correct. This is simple past tense.
“Have you received my message” is also correct. This is present perfect tense and could be used in a conversation that is going on.
Have happened or had happened? You use the pluperfect "Had had" when you’re already talking about something in the past, and want to describe stuff that happened before the (past) thing you’re talking about.
Grammar Usage:
You use ‘has’ when talking about he, she or it. You use ‘have’ when you are talking about I, you or they, and ‘had’ is the past tense of both.
I should be grateful if you would kindly send me your latest catalogue.
I would be grateful if you kindly sent me your latest catalogue.
Word Usage:
Would you please repeat again what you said? The word ‘Repeat’ itself means to do something ‘Again’. So, there’s no need to add ‘Again’ with ‘Repeat’.
But, “Could you please repeat it?” or “Please repeat it.” or “Pardon, please.” are the sentences which can be used instead of those two words.
Si può anche chiedere:, can you please let me know or please let me know? 1 Answer. The words are acceptable but the punctuation is not. Your two options for correct comma placement would be: "Could you, please, let us know when …"