There's a man on the roof.
There's a train at 10.30.
There are seven days in a week.
singular
there is … (there’s)
there is not … (there isn’t or there’s not)
plural
there are …
there are not … (there aren’t)
There’s a big tree in the garden.
There’s a good film on TV tonight.
A: Have you got any money?
B: Yes, there’s some in my bag.
A: Excuse me, is there a hotel near here?
B: Yes, there is. / No, there isn’t.
We can’t go skiing. There isn’t any snow.
There are some big trees in the garden.
There are a lot of accidents on this road.
A: Are there any letters for me today?
B: Yes, there are. / No, there aren’t.
This restaurant is very quiet. There aren’t many people here.
How many players are there in a football team?
There are 11 players in a football team.
There’s a book on the table.
(not 'It’s a book on the table.')
I like this book. It’s interesting.
(it = this book)
Compare:
‘What’s that noise?’ ‘It’s a train.’ (it = that noise)
There’s a train at 10.30. It’s a fast train. (it = the 10.30 train)
There’s a lot of salt in this soup. I don’t like this soup. It’s too salty. (it = this soup)
there was / were / has been etc. → UNIT 37 | it and there → UNIT 38 | some and any → UNIT 75