We are British.
We are from The UK.
They are Spanish.
They're from Spain.
You are Chilean.
You are from Chile.
He is Mexican.
He is from Mexico.
She is from Canada.
She is Canadian.
She is Japanese.
She is from Japan.
She is Australian.
She is from Australia.
I'm from Portugal.
I'm Portuguese.
I'm from China.
I'm Chinese.
He is from Turkey.
He is Turkish.
I'm from France.
I'm French.
He is American.
He is from The USA.