Yes, I am., Yes he/ she is., Yes, it is., Yes, they are.
Are you helping your sister now?
Are your friends behind that tree?
Are you at school now?
Are the children helping their mother?
Are they playing outside?
Is John friendly?
Is your brother helpful?
Are you serious?
Is your friend hungry?
Is the book boring?
Is this your book?
Is she Estonian?
Are these your messages?
Is it your schoolbag?
Is the note in the box?
Are your sisters five years old?