1. 肯定句：I am eating.
特殊疑问句：What are you doing?
一般疑问句：Are you eating?
否定句：I’m not eating.
2. 肯定句：We are reading books now.
特殊疑问句：What are you doing now?
一般疑问句：Are you reading books now?
否定句：We aren't reading books now.
3. 肯定句：The boys are playing football over there.
特殊疑问句：What are the boys doing over there?
一般疑问句：Are the boys playing football over there?
否定句：The boys aren't playing football over there.
4. 肯定句：The boy is listening to the teacher.
特殊疑问句：What is the boy doing?
一般疑问句：Is the boy listening to the teacher?
否定句：The boy isn't listening to the teacher.
5. 肯定句：It's eight o'clock. Jimmy's parents are watching TV.
特殊疑问句：What time is it? What are Jimmy's parents doing?
一般疑问句：Is it eight o'clock? Are Jimmy's parents watching TV?
否定句：It isn't eight o'clock. Jimmy's parents aren't watching TV.
6. 肯定句：My mother is making a cake for my birthday.
特殊疑问句：What your mother is doing (for your birthday)?
一般疑问句：Is your mother making a cake for your birthday?
否定句：My mother isn't making a cake for my birthday.
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参考资料：英语牛人团