Might / Perhaps
This expression is used to indicate that something is possible or likely to happen.
Examples
明日は雨が降るかもしれない。
It might rain tomorrow.
彼女は学校に遅れるかもしれない。
She might be late for school.
週末は混むかもしれない。
It might be crowded on the weekend.
Quick check
It might rain tomorrow. 明日は雨が降る___。