1<span>sits
2</span><span>are reading
3</span><span>play
4</span><span>do
</span>5<span>are reading</span>
Если по заданию, как в учебнике, в Past Continuous, то так:
1. I was not studying last night.
2. My parents were not working last Saturday.
3. It was not raining yesterday.
4. We were not doing an exam at nine o'clock.
5. I was not waiting for you.
6. We were not speaking English.
<span>I bought a carton of milk. I ate a loaf of bread</span>.