6. Они, должно быть, работают в лаборатории. Не следует им мешать. 7. Почему ты не пришла вчера? — Я должна была встречать двоюродную сестру на вокзале. — Тогда ты должна была бы позвонить, мы бы тебя не ждали.
6. They must be working in a laboratory. Should not interfere. 7. Why didn't you come yesterday? I was supposed to meet the cousin at the station. Then you would call, we would have been waiting for you.
6. They must be working in a laboratory. Do not disturb them. 7. Why did not you come yesterday? - I was supposed to meet my cousin at the train station. - Then you would have to call, we would not expect you to.
6. they must be working in the laboratory. should not disturb them. 7. why didn't you come yesterday? - i was supposed to meet my cousin at the station. - then you'd have to make a phone call, we weren't expecting you.