I sent him a text today morning asking him whether he can/could over to my place today evening.
Are both options grammatically correct? Can can or could either be used in this context, since the person the speaker sent the text to hasn't responded yet, and alongside that, it's not evening time yet?
I was thinking what will/would happen tomorrow.
The same goes for this one, it's not tomorrow yet, so I could just mix the tenses and it'd still be grammatically correct, right?