1) Q. How long have those boys been playing marbles ?.
Ans . They have been playing marbles for one hours.
2) Q. How long has your mother been cooking ?
Ans: she has been cooking for two hours .
3) Q. How long has the student been listining ?
Ans : He has been listining for forteen hours.
4) Q. How long has Daphné been watching TV ?
Ans. She has been watching TV for four hours.
5) How long have you been reading ?
Ans. I have been reading for seven hours.