Collins says to use a singular noun after 'two/three/ten etc types of':
There are three types of muscle in the body.
...two types of playgroup.
But I searched the TIME magazine Corpus and found nearly as many plural nouns as singular nouns. How do you native speakers use this structure with nouns?
Thank you in advance.
Last edited by joham; 04-Nov-2008 at 07:56. Reason: One word added.
I happily use plurals here. Three types of person doesn't sound as good to me as three kinds of people; to me, there is a notion of plurality in the phrase which is not present in your muscle example, where the focus is on tissue, activity, etc, rather than the number.