May I use the past participle "Has been" instead of "Have been" in the following sentence?.
This mail should have been sent few hours ago due to messaging error. I apologize for being late.
No. Say eg This e mail should have been sent a few hours ago but it was not, due to a messaging error. I apologize for being late.
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No.
Say eg This email should have been sent a few hours ago but it was not, due to a messaging error. I apologize for being late.