How often does your mom clean her bedroom?
She/my mom cleans her bedroom ...
What was there in the forest near your house?
What was there to explore in your city when you were young?
Comfortable armchair
skydiving
Weren't there any mandarins at the supermarket?
Yes, there were some.../No, there weren't any ...
Was there a creepy man running on the street?
Yes, there was ..../No, there wasn't .....
blackout curtains
indoor plants
How often do those girls go surfing?
Who was chopping onions around here?
___ was/were chopping onions around here.