Chuyển các câu sau sang phủ định và nghi vấn.
1. Lan saw you in the park last week .
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2.We were in the countryside last summer.
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3.Mrs.Robinison bought a poster.
+........,............................
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4.Liz enjoyed her vacation in Da Lat last year.
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5. Her aunt gave her a new skirt
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6.He was in our class two hours ago.
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