Chose the correct article from the options.
My sister will come in ___day or two.

A

The correct article to use in the blank is a. We use a before singular, common nouns that are indefinite. The word day is a singular, common noun that is indefinite, so we use the indefinite article a.

The other options are incorrect.

• An is used before singular, common nouns that begin with a vowel sound.
• The is used before singular, common nouns that are specific.
• No article is not used before singular, common nouns.