đổi thành câu bị động xác định rõ tân ngữ how many trees did they cut down to build that fence?

2 câu trả lời

-how many trees did they cut down to build that fence ?

 =>How many trees were cut down to build that fence ?

Tree là tân ngữ

How many trees did they cut down to build that fence?

→How many trees were cut down to build that fence?

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Tân ngữ: tree

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