thanks Prof.
what i have discovered with the rules a/an is the following
EFL students get mixed up when they use adjectives with nouns
the best way to teach that is by
we use a/an with singular countable noun
so first the noun has to be singular and then a count or a countable noun
for example
it is a car
it is an expensive car
it is an office
it is a new office
see the above differences
two
with plural nouns , we can not use a/an
such as cars or oranges
thirdly,
with uncountable noun or as the British people call it noncount noun, we can not use a/an such as
rice or coffee
so we say it is coffee
or it is expensive coffee
without a/an
can somebody traslate or even summarize the bove
thanks all