1. Exclamations with what...!
What a beautiful day!
What a nice surprise!
What *** nice shoes!
What *** good friends they are!
What *** awful weather!
What *** delicious food!

2. Always uncountable
Behaviour, traffic, weather, accommodation, health, progress, scenery, rubbish, work, politics, athletics, economics
These nouns don’t have a plural form
Always use a singular verb
Never use a/an

3. Always uncountable
Furniture, information, advice, homework, research, news, luck, bread, toast, luggage, equipment
Rules 1, 2 and 3 apply, and
Use a piece of to talk about an individual item

4. Always plural
Arms, belongings, clothes, manners, outskirts, scissors, trousers, shorts
These nouns don’t have a singular form
Always use a plural verb
Never use a/an
If they consist of two parts, you can refer to an item using a pair of or some

5. Collective nouns Police, crew, staff, Brazil (= the Brazilian team)
These nouns refer to a group of people
Always use a plural verb

6. Iron, glass, chocolate, business, paper, light, time, space, coffee
These nouns change from countable to uncountable, with different meanings.