1. Have you
ever seen the Pyramids?
2. I went
to the Caucasus two years ago.
<span>3.Ann had prepared dinner by 6 oclock yesterday.
4.They were drinking tea when I came home.
5.While mother was cooking I was doing my homework.
6.when we came to the station.the train had already arrived.
7.They were very tired.They had been hiking for more than 5 hours.
8.</span><span>Today is Tuesday, and John has been late twice this week; he was late yesterday and on Monday.
9.Yesterday at 2 o'clock I was watching a very interesting film.
10. She is very happy. She was walking with her friends all day yesterday.
11.</span><span>What have you been doing here since morning?</span>