Sentence Formation from a Scaffolding Device: Present Continuous

(TESOL Worksheets--Present Continuous, Any Grammar Point)
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The specific example linked to above is for the present continuous, but the general activity can be used for any grammar point.
Have a scaffolding device where students choose from different columns to form sentences.  Students can ask each other questions and answer them using the scaffolding device.  To make this more controlled, give the students all the language they will need on the scaffolding device.  To make this less controlled, students have to add additional information.  In the example linked above with present continuous sentences, this scaffolding device could be made less controlled by deleting the final column with the objects, which the students would then have to supply themselves.

What	am	I	doing? wearing? playing? eating? watching? listening to? reading?
	is	he she it
	are	you we they

I	am	doing wearing playing eating watching listening to reading	homework the laundry a t-shirt a sweater a dress jeans video games the piano soccer pizza an apple chocolate a movie TV Youtube music the radio a book the news a magazine
He She It	is
You We They	are