Tense

I am waiting for the comp to attach the BAC model to my email.
I was about to go to sleep when I received your msg.
I was smiling to myself when I read your postcard.
I was looking at you to see if you were looking at me.
I did it to you so that you won't be the one doing it to me first.
I am waiting fot the comp to attach the model to the mail.