Chuyển những câu sau sang phủ định và nghi vấn
1 . There are twelve nine years old .
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2. He is an engineer .
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3. That is my teacher .
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4 . His name is Tuan .
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5 . They are teacher .
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6 . These are pencil .
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7 . My school is in the city .
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ai nhanh mk tick và mk sẽ tặng kèm 1 tấm ảnh chế