Откройте скобки 1.jane (to learn) a lot of things about animals by friday. 2.the students ( to prepare) for the trip by that time yesterday. 3.i was surpised, because i never ( to see) a grizzly bear. 4.the forest was full of rubbish. somebody (to thow) it. 5.when the students ( to return) their friends ( to go) away. 6. when we (to reach) the forest the travellers already (to camp). 7.the students (to solve) some ecological problems in the camp by sunday.

1has learnt
2prepared
3have never seen
4has thrown
5were returning, went
6reached, were already camping
7have solved

1.Jane learnt a lot of things about animals by Friday.
2.The students was prepared for the trip by that time yesterday.
3.I was surprised,because I never saw a grizzly bear.
4.The forest was full of rubbish. Somebody throwed it.
5. When the students returned their friends to go away.
6. When we reached the forest the travellers already were camping.
7. The students solved some ecological problems in the camp by Sunday.