This is my friend. ____ name is Bob and ____ is 12 years old.
Do you know who to take part in the competition?
—Did your sisters go to the concert last night?—No, we went to my aunt's birthday party.
—David, someone called you last night.—Oh, who was ?
We all think Bill is taller of the two.
—Lucy, it's too hot. Put the meat in the fridge, or it will bad.—OK, Mum!