Могли бы вы мне ? желательно ! 30 . 1.i (not to be) sure now that they(to write) the test by four o'clock. 2.when we (to help) our mother about the house last sunday,our father (to come) and (to invite) us to cafe. 3.look! the emergency services (to remove) the sand which oil (to cover). 4.what you (to achieve) by the year 2010? заранее,огрмное ! < 3

1. I am not sure now that they will write the test by four o'clock.
2. When we helped/were helping our mother about the house last Sunday, our father came and invited us to cafe.
were helping - если имеется ввиду весь день. Вот весь день мы маме пришел папа и позвал.
helped - мы в какой-то определенный момент в тот же момент пришел папа и позвал.
3. Look! The emergency service is removing the sand which is covered with oil.
4. What did you achieve by the year 2010?