Determiners - Indefinite

Articles a / an

We use a/an + singular countable noun.

• I have a new car. 
• She has a brother and a sister.

We cannot use a/an before a plural noun or an uncountable noun.

• We need to buy a sugar. ❌
• I need to buy sugar. ✅
• We saw a very beautiful places. ❌
• We saw very beautiful places. ✅