Question

Difference between certain and a certain . ​

Answer 1

Both are adjectives and the meaning is the same. But there is a difference in frequency. In colloquial language "sure" is the word used, whereas "certain" is a variant that is less frequent in spoken language. In written language "certain" can be used as a means of variation.

Answer 2

Answer:

Explanation: We use Plural noun with "Certain" and Singular Noun with "a certain"

Certain+Plural Noun

A Certain+Singular Noun