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Having been introduced. Past time clauses. was introduced какое время. clauses of time introduced by list. clausal ellipsis.
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Having been introduced. Глаголы to invent и to discover.. had been invented время. discover invent find out разница. what inventions had been made by the end of the 19-20th century?.
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Having been introduced. Been gone правило present perfect. has gone has been правило. has gone to has been to правило. present perfect been or gone правило.
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