What are they doing?
They're running.
What's this?
It's a shirt.
This is/These are my book.
This is
What are these?
They're gloves.
This is/These are my friends.
These are
Is he reading?
No, he isn't.
Does he like the shirt?
Yes, he does.
This is/These are my house.
This is
What's she doing?
She's cooking
Does she like carrots?
Yes, she does.
What are these?
They're trousers.