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?

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

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

*Tân ngữ ( object ) là "trees"

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