l a I hope many people will come to the disco.
  b I hope a lot of people will come to the disco.
2 a My teacher is organising a concert with much music.
  b My teacher is organising a concert with a lot of music.

We use many with countable nouns and much with uncountable nouns in negative statements and questions:
I didn't have  at the party.
Did you take  when you were on holiday?

We sometimes use a lot of in positive and negative statements and questions, in informal and spoken English, though it is not considered correct in written and formal English:
I tried on  in the shop. 
I didn't have  at the party.
Did you take  when you were on holiday?

We use a lot without a noun:
The teacher told me about his experiences.

We use much without a noun in negative statements and questions: 
The lesson was interesting, but we didn't learn .
Do you use the Internet ?



1) a. There are a lot of chairs in the room.
    b. There are many chairs in the room. 
2) a. I didn't buy a lot of pens. 
    b. I didn't buy many pens. 
3) a. Do you know a lot about plants? 
    b. Do you know much about plants? 
4) a. I like places with a lot of people.  
    b. I like places with many people.
5) a. Sorry, I haven't got a lot of time.
    b. Sorry, I haven't got much time. 
6) a. I cooked a lot of Italian food. 
    b. I cooked much Italian food. 
7) a. I like tea, but I don't drink a lot.
    b. I like tea, but I don't drink much. 
8) a. Do you read a lot of books? 
    b. Do you read many books?