把句子变为一般疑问句,并作肯定、否定回答：I have a sister and brother.and需要改为or吗?不改可以吗?怎回答呢?John and Mike are doing homework.这个变为一般疑问句或否定句要把and改为or吗

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• 把句子变为一般疑问句,并作肯定、否定回答：I have a sister and brother.and需要改为or吗?不改可以吗?怎回答呢?John and Mike are doing homework.这个变为一般疑问句或否定句要把and改为or吗
• .Today is the twins’ birthday (生日) .They are twelve.Jim,Mike,Kate andToday is the twins’ birthday (生日) .They are twelve.Jim,Mike,Kate and Bill are the twins’ friends.They want to buy some things for them.There is a big shop near their school.It sells a lot of things.From the shop,people can buy some food,some drink,and some school things,like cakes,apples,milk,oranges,hamburgers,exercise books and so on.The shop closes very late.So they can buy things
• Tom's Helen's brother.Helen is Tom's sister.（合成一句话）合成如下句型Tom and Helen ____ ____ and ____ .