It's a very simple question, but I feel puzzled for some reason.

I am Russian. They are... Russian or Russians? (Some people from Russia are meant here.)

He is Greek. They are... Greek or Greeks?

I would say "They are Russian/Greek/English/Portuguese".

Please correct me if I am wrong.

It's a very simple question, but I feel puzzled for some reason.

I am Russian. They are... Russian or Russians? (Some people from Russia are meant here.)

He is Greek. They are... Greek or Greeks?

I would say "They are Russian/Greek/English/Portuguese". Should I use the adjective (Russian) or substantivized adjective (Russians) in sentences like these?

Please correct me if I am wrong.

It's a very simple question, but I feel puzzled for some reason.

I am Russian. They are... Russian or Russians? (The people from Russia are meant here.)

He is Greek. They are... Greek or Greeks?

I would say "They are Russian/Greek/English/Portuguese". Please correct me if I am wrong.

It's a very simple question, but I feel puzzled for some reason.

I am Russian. They are... Russian or Russians? (Some people from Russia are meant here.)

He is Greek. They are... Greek or Greeks?

I would say "They are Russian/Greek/English/Portuguese".

Please correct me if I am wrong.