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They play the guitar in the small yard every evening. 

Who play the guitar in the small yard every evening?

Where do they play the guitar every evening?

When do they play the guitar in the small yard?

What do they  in the small yard every evening?

When do they play the guitar?

Where do they play the guitar?

In what yard do they play the guitar?

What instrument do they play in the small yard?

What do they do in the small yard?

How often do they play the guitar?