That would be a compound sentence......and that is when 2 independent sentences are separated by a comma and a coordinating conjunction
1 My friend called me at 11 o'clock
last night, just as I went to bed.
2 I had a terrible headache all
day - I took three headache
tablets, but it won't go away.
3 When I looked out of my window this morning, everything was white because it snowed all night.
4 I waited to speak to the professor for over two hours, but she still hasn't arrived.
5 I find university life difficult. I studied here for nine months, but I still haven’t made any close friends.
6 I couldn't open the door because I forgot to bring my key.
7 That dog is driving me mad. It barked all morning!
Answer:
I stood there and watched him <u>drove </u> away.
3rd one is the correct one
