My hair is a mess.
There was a hair in my soup.
She was horrified. She found a grey hair in her hair.

The advice (that) you gave me was very good. 

I bought a piece of old furniture. = Ostin yhden vanhan huonekalun.
The furniture you gave me was in good shape. = Huonekalut, jotka annoit minulle, olivat hyvässä kunnossa.

I caught a salmon.
He caught two salmon.

a reindeer / thousands of reindeer

a deer / many deer
an elk / many elk
a moose / many moose
a fish / many fish (many fishes)
There is plenty of fish in the lake / in the sea.

Beer is beer. A beer, please.

Do you like coffee? A coffee, please.

-craft
an aircraft / many aircraft

The clothes I wear are old.
a piece of clothing / a garment = yksi yksittäinen vaatekappale
a cloth / many cloths
a table cloth // My Mother had dozens of table cloths. = Äidilläni oli kymmeniä pöytäliinoja.

Yesterday's news was yesterday's news.
That was an item of good news.
a news item

NB!
advice
evidence
equipment
furniture
information
baggage / luggage
news
money
jewellery / jewelry

NB! knowledge:
Mary has a working knowledge of French.

on stage: Did you ever see Seela Sella on stage?
a playwright = a dramatist

a theater (AmE)
a theatre (BrE)
a center (AmE)
a centre (BrE)

James' / James's school was Eton.
Charles' / Charles's wife is Camilla.

Jack and Jill's mother is a professor. = Jackin ja Jillin äiti oli professori.