What it means
かもしれない expresses uncertainty: something might be true, may happen, or is possibly the case. It presents the statement as one possibility rather than a confident prediction. It follows the plain form of a verb or an i-adjective, and it follows a noun or a na-adjective directly. Its polite counterpart is かもしれません.
Usage note
With nouns and na-adjectives, do not add な before かもしれない. The negative form ないかもしれない means that something might not happen or might not be true, so it is different from expressing certainty that something will not happen.
How to use it
田中さんは先生かもしれません。
Mr. or Ms. Tanaka might be a teacher.
この道は静かかもしれません。
This road might be quiet.
このかばんは重いかもしれません。
This bag might be heavy.
来週、雪が降るかもしれません。
It might snow next week.
田中さんは先生かもしれない。
Mr. or Ms. Tanaka might be a teacher.
この道は静かかもしれない。
This road might be quiet.
このかばんは重いかもしれない。
This bag might be heavy.
来週、雪が降るかもしれない。
It might snow next week.