The cake was so tasty that I ate it all.
Was the cake tasty? (G.)
What was tasty? (S.)
I got the figures somewhere else.
Did I (you) get the figures anywhere else? (G.)
What did you (I) get? (S.)
I forgot to phone you.
Did you (I) forget to phone me(you)? (G.)
What did I (you) forget? (S.)