Transformation ...

Write in reporting speech:

Convert the following conversation to indirect speech:
Sam: I can't open the door as the key isn't turning.
Sue: Try turning it the other way.

Write in reported speech:
Sam: How often do you go away on holiday?
Sue: Once or twice a year.

Convert the given statement into a yes/no question. Ensure that the meaning of the sentence remains unchanged as far as possible. 

They had been playing in the garden this afternoon. 

Convert the given statement into a yes/no question. Ensure that the meaning of the sentence remains unchanged as far as possible. 

They have filed a complaint recently. 

Convert the given statement into a yes/no question:
(Ensure that the meaning of the sentence remains unchanged.)
Mary has been studying all night.

Select a suitable yes/no question that corresponds to the given response:

Yes, I have been listening to you. 

Convert the given statement into a yes/no question. Ensure that the meaning of the sentence remains unchanged as far as possible.
 
I think they should go home now.