V-기 시작하다
Add -기 시작하다 after a verb stem to say that an action begins. It is useful for moments when something starts happening, as in '흔들리기 시작했다' meaning 'started to shake.' You can reuse it in sentences like '비가 오기 시작했어요.' which means 'It started to rain.'
비가 오기 시작했어요.
It started to rain.
