An extension

JigneshbharatiHow to determine or check that "extension" is a countable noun

Note that "extension" is preceded by "an". Only a countable noun can have "an" (or "a") before it.

Jigneshbharatiwithout checking the (should I omit the here?)dictionaries?

I would omit "the". Yes. But it's better to write "without checking a dic

I want to know how to decide if extension is countable or uncountable in order to assign the correct article. Thanks

Jigneshbharatihow to decide if extension is countable or uncountable

In what sentence do you want to use "extension"? We need to know what meaning you have in mind for "extension", and we need a whole sentence to determine that. After that we can take a look at whether you're using "extension" with a countable meaning or with an uncountable meaning.

In the question itself- non finite verbs are an extension of a sentence.

Jigneshbharati In the question itself- non finite verbs are an extension of a sentence.

an extension

"extension" is used as a countable noun in your sentence. We know this because it has "an".

I said this in my first reply.

CJ

Thank you but in my writing how would I know it is a countable noun as I am learning about articles. So to assign article one needs to be able to identify countable nouns.

Can you give examples where it can be used as countable as well uncountable?

Jigneshbharatito assign article one needs to be able to identify countable nouns.

The only article-noun combination you cannot have is "a/an" with an uncountable noun. Other than that, you can have any other combination.

For example, the nouns "equipment", "information", and "furniture" are uncountable, so you cannot have "an equipment", "an informat

Jigneshbharati Can you give examples where it can be used as countable as well uncountable?

I can't think of any examples where 'extension' is uncountable.

CJ

Thank you for your time and help