people completed the empire state building in 1931 the empire state building

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1. People completed the empire state building in 1931

   => The empire state building was completed in 1931.

   Giải thích: Câu bị động ở thì quá khứ đơn:

   S+ v(ed) + O => S + was V2 + (by O)

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2. The empire state building was completed in 1931. ( Câu bị động ở thì quá khứ đơn ) 

    ( CT : S + was/were/ + V (PII) + ( by + O ) + time ) 

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