Countable nouns represent things we can count. e.g. PC, window, ball, people
With countable nouns we use question "How many?". e.g. How many cities have you visited?
a few, She has a few good friends.
a number (of), There are a number of tasks we need to do.
several, We have to apply several changes.
a large number (of), There is a large number of PC-s connected to the Internet.
a great number (of), He has a great number of choices.
Uncountable nouns represent things we cannot count. e.g. money, advice, strenght, luck
With uncountable nouns we use question "How much?" e.g. How much knowledge do you need?
a little, He has a little knowledge about processors.
a bit (of), You need a little bit of luck.
a great deal of, She has a great deal of potential.
a large amount of, I won a large amount of money.
Some nouns can be countable and uncountable. e.g. time Some quantifiers can stand both with countable and uncountable nouns.
With nouns that can be countable and uncountable we use questions "How many?" and "How much?"
no/none, She has no time to waste.
not any, I haven't got any idea.
some (any), We have some time for rest.
a lot of, I got a lot of gifts.
plenty of, We have plenty of work.
lots of, It has lots of opportunities.