1.The dentist told a patient to open his mouth,so he could see the bad tooth clearly.
2.John asked his student whether(if) he could borrow his pen or not.
以上是标准的变化
1.The dentist told a patient to open his mouth,so he could see the bad tooth clearly.
2.John asked his student whether(if) he could borrow his pen or not.
以上是标准的变化