1. they can not do this work themselves
2. you may take my dictionary.
3. you don't look well, you should consult the doctor.
4. why would i give you my money?
5. she can not speak any foreign language.
6. he ought to help them, they need his help.
7. can you tell me the time?
8. may i go with you? no, you may not.
9. your daughter needn't have told about it.
10. in winter we can often skate.
11. you must not miss your classes.
12. could you play the piano before?
school, dmiti in mathematics, physics, and geography but was not good at languages. in 1855 he graduated from pedagogical institute in st peterburg with a gold medal fo his 1856,he in chemistry. dmitri mendeleev's contribution to the world's science was was the first the dependence of the qualities of the elements on their atomic weight. he forecast that the gaps in the table of elements
would be filled in by elements whith yet. dmitri mendeleev was greatly honoured as a of academies in many countries. elements no 101 him.