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.