Try it: ___ a cafe on Moffen Street. (There is / It is / Have) Answer: There is — For one thing that exists, use There is. "It is" says what something is; "Have" is for owning.
There are = more than one
Use There are for two or more.
There are two cafes in Senfarren.
There are three beds in the room.
There are five students here.
Try it: ___ three beds in the room. (There are / There is / It is) Answer: There are — Three beds = more than one, so use There are.
Try it: ___ four windows in the kitchen. (There are / There is / There be) Answer: There are — Four = more than one, so use There are. Use There is only for one.
Asking
To ask, put is / are first: Is there...? Are there...?
Is there a bank near here?
Are there two beds?
Is there a problem?
Try it: ___ a bank near here? (Is there / There is / Is it) Answer: Is there — To ask, is comes first: Is there a bank? "There is" tells, it does not ask.
There isn't = not one
For not one, use There isn't. (isn't = is not.)
There isn't a cafe here.
There isn't a problem.
There is not a key. = There isn't a key.
Try it: ___ a cafe on this street. (There isn't / There aren't / There no is) Answer: There isn't — A cafe is one thing, so use There isn't. (isn't = is not.)
There aren't = not two or more
For two or more that do NOT exist, use There aren't. (aren't = are not.)
There aren't two beds.
There aren't three chairs.
There are not five cafes. = There aren't five cafes.
Try it: ___ three chairs in the room. (There aren't / There isn't / There not are) Answer: There aren't — Three chairs = more than one, so use There aren't. (aren't = are not.)
Try it: ___ a desk by the window. (There is / Have / It has) Answer: There is — To say what exists in a place, use There is. "Have" and "It has" are for owning.