1. Let's go to the zoo together. (否定句)
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2. Turn on the radio. (用he做主语，改为一般将来时)
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3. I'm going to buy some beautiful flowers for my mother. (对划线部分提问)
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4. Nine people are coming to the party. (对划线部分提问)
_______________________________________________________________________1. Let's not go to the zoo together.
2. He will turn on the radio.
3. What are you going to do?
4. How many people are coming to the party?