'house' is a countable word. In the dictionary, you will see [C] after it, because it is 'Countable'. You can say 'a house' (singular) or 'some houses' (plural)
'sauce' or 'tomato sauce' is usually an 'uncountable' word. In the dictionary, you will see [U] after it, because it is 'Uncountable' You can say 'some tomato sauce'.
Choose the right word: 'a', 'an', 'some' or 'any'
When I was young I had ___ bicycle.
a
an
some
any
Have you got ___ car?
a
an
some
any
Last week I bought ___ flowers for my host mother.
a
an
some
any
I saw ___ really good film last night.
a
an
some
any
There were ___ Scottish boys in the disco last night.
a
an
some
any
___ people are allergic to cats. How about you?
a
an
some
any
Is there ___ mayonnaise in the snack-bar?
a
an
some
any
Excuse me. Is there ___ butter?
a
an
some
any
Could I have ___ more cheese on my pizza, please?
a
an
some
any
Would you like ___ apple with your packed lunch?
a
an
some
any
There weren't ___ students in the room when I arrived.
a
an
some
any
Look out! There's ___ wasp in the room!
a
an
some
any
Excuse me. Is there ___ shop near here that sells medicines?
a
an
some
any
There isn't ___ sugar in my coffee.
a
an
some
any
There are ___ beautiful lakes and mountains in Scotland.