We use there is with singular nouns
We use there are with plural nouns
a. There is a spider on the table.
b. There is a guest at the lobby.
c. There is a book in the box.
d. There is a hospital in Berkeley.
e. There are some people outside.
f. There are candies in the basket.
g. There are some exercises below.
h. There are animals in the jungle.Also see singular / plural