1. We don't have a car but we are going to buy one.
2. When I called Lucy, she was on the bus. [В английском языке "ON the bus" не подразумевает того, что объект находиться на крыше автобуса. Вот такой парадокс]
3. I'll meet you at the cinema. ['Я встречу тебя у кинотеатра'. 'In the cinema' звучит для меня, как будто встреча произойдёт в самом кинозале, что маловероятно.]
4. There is a spider on the bathtub. ['On the bathtub' звучит неестественно]
5. Why did you go to the opticians?
1) to has my eyes tested [Нет]
2) to have my eyes tested
3) to make a test of my eyes [Нет]
6. They covered the goods with canvas lest they be damaged by rain.
[Be damaged - это сослагательное наклонение (subjunctive). Найдите в интернете подробнее, если хотите, ибо ссылки здесь запрещены, а своими словами это немного сложно объяснить]
7. His (-) father in laws book was published abroad.
"После my/his/her и таких местоимений разве стоит артикль?". Нет, нет и ещё раз нет.
2) Mary had been invited to the party, but she couldn't make it.
3) The flowers are watered once a week.
4) The Smit's house had been painted last month.
5) The window has been breated by the boy last day.
6) The rubbish will have been collected next morning.
7) New cups have been bought tomorrow.