How many dancers are there?
There are three dancers.
How many dragons are there?
There's one dragon. / There's a dragon.
How many lanterns are there?
There are two lanterns.
How many dragons are there?
There are four dragons.
How many red envelopes are there
There are four red envelopes.
How many family members are there?
There are eight family members.
How many red envelopes are there?
There's one red envelope. / There's a red envelope.