Put the words in the right order to make up sentences.
We use the indefinite article a/an to say what a thing or a person is, what a thing or a person is like — when we speak about categories and characteristics.
This is a student.
"Windows" is an operating system.
A: What do you do? B: I'm an editor.
It's an interesting article, you should read it.
The moon isn't a planet.
She's wearing a black dress.