indefinite article

[lille82]

"Many people think ants are a pest." Could anybody please explain why the usage of the indefinite article is correct in this sentence? Thanks.

[emsr2d2]

They are one of a group of insects commonly referred to as pests. It could just as easily have said "Many people think ants are pests".

[lille82]

Could you give some other examples including this structure (plural noun + plural verb + a + singular noun?)

[emsr2d2]

Some people think spiders are a pain in the neck.
Many people think that traffic wardens are a nightmare to deal with.
Very few people think film directors are a marvel.

[lille82]

Thank you so much.

[5jj]

Thank you so much.

Most people agree that language forum moderators are a great benefit to humanity.

[Winwin2011]

Some people think spiders are a pain in the neck.
Many people think that traffic wardens are a nightmare to deal with.
Very few people think film directors are a marvel.

Hi ems

I am wondering if it is correct to say "Very few people think film directors are marvels."? Why do we use " a marvel" after "film directors are"?

Thanks.