'Apple' is a count noun, and you can count it as one, two, etc.

Nominalization is the linguistic process of converting verbs or adjectives into nouns.

Compound nouns are a very important part of Japanese grammar.

That is one of the formal nouns.

A noun phrase forms a major part of a sentence.

She is learning how to use prepositions in Chinese.

In Chinese grammar, separable verbs play a very important role.

His speech skillfully used interjections, captivating the audience.

It's difficult to make sentences using interrogatives.

It's difficult to make sentences using infinitives.