Question

ram is annoyed by .... his brother
​

Answer 1

Ram is annoyed by his brother.

Explanation:

For the above sentence, by would be the appropriate word in the blank space. By is a preposition here. It answers the question who or what annoys Ram here. By is mainly used as a proposition, but can sometimes be used as an adverb as well.

In the given sentence, we have the main part as Ram is annoyed. Reason is his brother. So we need to add a preposition to describe who is annoying Ram and hence we have used by.