连词成句的2、3、4题怎么做啊?

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连词成句的2、3、4题怎么做啊?

连词成句的2、3、4题怎么做啊?
连词成句的2、3、4题怎么做啊?
 

连词成句的2、3、4题怎么做啊?
2.What did early men use fire for 先人用火做什么?
3.We have to be careful when we use fire .我们使用火时必须小心.
4.Early men found fire very useful .先人们发现火十分有用.

2.What did early men use fire for ?
3.We have to be careful when we use fire .
4.Early men found fire very useful .