Answer:
When I saw the first Harry Potter film, I had not read any of the books yet.
"I was exhausted when I got home yesterday." "Why? What did you do all day?"
I can lend you the book at the weekend. I will finish it by then.
At this time tomorrow, we will stand on stage playing at our first concert.
You must have been scared when all the lights suddenly went out.
I didn't understand the lesson. I guess I should have concentrated instead of looking at my phone.
Hope this helped somewhat! :]