V+기도 하다 ~ Sometimes V happens

Any interesting little grammar point, V+기도 하다 is used to express when V sometimes occurs.

Examples
나는 기쁠 때 울기도 해요.
Sometimes I cry when I’m happy.
봄에 보통 춥지만 가끔 덥기도 해요.
It’s usually cold in the spring, but it is sometimes warm.
주말에 영화를 보기도 해요.
Sometimes I go to see the movies on weekends.