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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