Перепишите предложения, переведите их, обращая внимание на употребление формы per fect (present, past) в действительном и страдательном залогах. 1) scientists have found ways of measuring the sizes and positions of bodies in the universe. 2) a primitive steam-engine had been invented by thomas newcomen at the beginning of the 18th century. 3) our family hasn't heard from him for 5 months.

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