Помогите пожалуйста!!! нужно составить пять видов вопросов на английском языке к данному предложению.
John Leach, a survival instructor, has studied the behaviour of people in disasters around the world for several decades.
Помогите пожалуйста кому не сложно!)

1. Has John Leach studied the behaviour of people in disasters around the world for several decades?
2. For what John has studied the behaviour of people in disasters around the world?
3. Whom John has studied around the world for several decades?
4. Who has studied the behaviour of people in disasters around the world for several decades?
5. What has John studied in disasters around the world for several decades?

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