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Поставьте глагол-сказуемое во все временные формы continuous и perfect в страдательном залоге: the system of secondary education in the united states is known to be a conglomeration of many different kinds of institutions.

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Is known was known has been known had been known will be known will have been known в continuous глагол to know нельзя поставить 

1)By two o'clock the teacher had examined all the students

2) Oh my way to school I had left my report at home

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