Turn the sentences into negative and interrogative forms. (Chuyển sang phủ định và nghi vấn)

VI.     Turn the sentences into negative and interrogative forms.( Chuyển sang phủ định và nghi vấn)
1.  They were in Rio last summer.
     ------------ They were not in Rio last summer -------------------
     ------- Were they in Rio last summer ?-------------------- 
2.  We did our exercise this morning.
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3.  My parents came to visit me last July.
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4.  The hotel was very expensive.
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5.  I had a bicycle when I was young
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6.  The children went to the zoo yesterday.
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7.  Ernie ate the last doughnut.
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8.  They bought a new house last month.
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