句型转换。
1. He has worked in this factory for 10 years . (就画线部分提问)
________ ________has he worked in this factory?
2. We have been playing football for two hours. (就画线部分提问)
________ ________have you been playing football?
3. I'm thinking about becoming an English teacher after graduation. (就画线部分提问)
________ ________ ________ ________ ________you thinking about ________ after graduation?
4. He has learnt English for 5 years. (改为同义句)
He has learnt English________ ________ ________ ________.
5. He started to practice the guitar three hours ago. (用for改为同义句)
He________ ________ practicing the guitar for three hours.
