6.9. Замените модальные глаголы can,may иmust эквивалентамиto be able to, to have to, to be to, should, to be allowed to: 1.The roots of the cypress tree can absorb water and minerals from the rocky soil.
2.You must ask for the permission of the forestry officer if you want to visit this area.
3.This tree looks mysterious. May I come closer to it?
4.Some vascular sporophytes can attain very large sizes because vascular tissues supply water to the uppermost parts of the plants.
5.You may not stay in the national park if you don't have a special permission.
6.These ancient trees cannot evolve further on such poor soils, they must find another ecological niche.
7.Forest workers must not be mistaken when they use chemicals in forestry operations.
8.Some of bryophytes can survive periods of dryness by becoming dormant – or inactive.
9.The researchers must finish the experiment on new man-made propagation methods by the end of the month.
10.The students may watch the growth of evergreen plants in the University's greenhouse, if they like.

1. We have live in Moscow now since 1960
2. I have studied English twice a week since childhood
3. It has been powered by the company three days a week for two years
4. They have gone to the store every Saturday since they moved here
5. We have meet each other sometimes for many years
6. I have known this man now since we went to school
7. I've been here every day since 9 o'clock
8. He has played football once a week since early childhood
9. He has driven a car now since he got the driving license
10. They have received letters from him regularly since last spring

I was born in a small town on the Volga. As a child I was often sick n why he didn't like noisy games. I beat Liu books. The city was not their (local) theatre, but when he came to the Saratov theatre (company), I never missed an opportunity to look at them performances. I so loved the theater that he decided to become an actress after I graduate from school. I participated in an Amateur (amateur) performances, and several times during the holidays we went to Moscow to watch performances from such great actors, as Moskvin, Paschen, Kacha fishing, one Day, Tarasov.
Finally the day came, when I first came on the scene well of this house. I was so worried that didn't notice, as the curtain rose. When I spoke to him, I didn't recognize his own voice. Then ended the first act and the curtain has fallen. I felt that I was crying because I was very upset: I thought I was bad played a role. I was approached and spronin why I was crying. "Don't you hear the audience applauding you? You played perfectly.
At first I believed it, but then I was under my teacher, one of the oldest actors of the theatre, and said that he really liked my playing. I was approached the other actors and said that I had fulfilled my role. It was the happiest day of my life.