 and an can only be used with nouns in the singular if we don't mean a special thing or person. Some can only be used in the plural if we don't know the exact amount of something or if we use nous we can not count, e.g. liquids.

a-an-and-some-conversation-topics-dialogs_126252.docx

Prefixes (e.g. A, UN, IM, DIS, MIS, EN, etc. )

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A, an and some

a-an-and-some

 and an can only be used with nouns in the singular if we don't mean a special thing or person. Some can only be used in the plural if we don't know the exact a…