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-Every boy and every girl in Russia must go to school, that is, they must get a fool secondary education. 

Must every boy and every girl in Russia  go to school? Every boy and every girl in Russia mustn't go to school.

Must they get a fool secondary education? They mustn't get a fool secondary education.

-After finishing 9 classes of secondary school young people can continue their education at different kinds of vocational or technical schools or colleges .

Can  young people  continue their education at different kinds of vocational or technical schools or colleges  after finishing 9 classes of secondary school?  After finishing 9 classes of secondary school young people can't continue their education at different kinds of vocational or technical schools or colleges . 

-Having finished a secondary school, a technical school or a college young people can start working or they may enter an Institute or a University.

Can  young people  start working or enter an Institute or a University  having finished a secondary school, a technical school or a college?

May  they enter an Institute or a University   having finished a secondary school, a technical school or a college ? Having finished a secondary school, a technical school or a college young people can't start working or they may not enter an Institute or a University.