we must keep quiet when others answer question 改为祈使句i think lily has to stay at home at night 改为否定句

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we must keep quiet when others answer question 改为祈使句
i think lily has to stay at home at night 改为否定句

1 Let's keep quiet when others answer question.
2 I don't think lily has to stay at home at night
加油!不明白再问!