They are both somewhat correct, but 'on what date' is the most used one.
"Please let me know a time and date that is convenient for you." is grammatically correct.
He, you and I is not grammatically correct. The proper way to say this is you, him and I.
Yes, soonest is correct grammatically.
Currently we have is grammatically correct.
Yes, it is grammatically correct.
"Please let me know a time and date that is convenient for you." is grammatically correct.
Usually, either can be correct. Consider: "It was the 25th of June." and "May 13th, the day it all went wrong." However, when using the contracted form of the date, it's not grammatically correct. Example: "It was the 25/6/09" isn't grammatically correct.
'She does not have her book' is grammatically correct.
He, you and I is not grammatically correct. The proper way to say this is you, him and I.
Yes, soonest is correct grammatically.
"Not like that" can be grammatically correct, depending on the context.
Yes! That is grammatically correct!
Yes, 'for free', is grammatically correct.
Yes it is a grammatically correct
Currently we have is grammatically correct.
This is not grammatically correct. The correct form is 'you do not know', or the abbreviated 'you don't know'.
Yes, it is grammatically correct.