There is / There are

There is a ...  /  There are some...

There is a...
There isn't a ...

There are some...
There aren't any....

Is there a...?

Are there any...?

LEARN AND PRACTISE:

http://www.agendaweb.org/grammar/there_is_are-exercises.html

http://www.englisch-hilfen.de/en/exercises/various/there_is_there_are.htm