A and an are __________ articles

I saw ___________ man. ________ man is sleeping on the bed.

Smita is eating _______ apple. She also has _____ mango with her

 Iam a definite article.

5. ________ sun is at the centre of the solar system.

A or an can be used before a singular noun

Monday is a first day in an week. (Are the articles used in the sentence correct?)

There are an birds in the nest. (Is the sentence correct?)

Mathu and Neethu are having coffee in the Rex cafe. (Is the article used in the sentence correct?)

10. Article the can be used for plural nouns