First, study these examples.
— What is it? — It is a game console.
— Who are those girls? — They are my friends.
In sentences like these, we use the question words
- what — to ask about things
- who — to ask about people
and the verb "be" in the correct form (am/is/are).
A question sentence has the following word order:
what/who + am/is/are + subject
What is it?
What is your name?
What is your hobby?
What is her favourite colour?
Who is she?
Who is that man?
Who are these people?
Who is your favourite actor?
It is very simple to answer this type of questions. All you have to do is invert the word order. We start from the end of the sentence, from the subject.
Question: what/who + am/is/are + subject
Answer: subject + am/is/are + ...
What is it? It is a 3D pen.
What is your hobby? My hobby is windsurfing.
What is her favourite colour? Her favourite colour is red.
Who is it? It is my neighbour.
Who are these people? These people are our guests.
Who is your favourite actor? My favourite actor is Benedict Cumberbatch.