kikimasu--- (I, you, he, she, we, they, it etc) listen
watashi wa podcast o yoku kikimasu.---I often listen to podcasts.
kikemasu---(I, you, he, she, we, they, it etc) may listen, be allowed to listen
Podcast de iroiro na gogaku bangumi ga kikemasu.---You can listen to many language programs on podcasting.
kikoemasu---(I, you, he, she, we, they, it etc) can be heard
hako no naka kara hen na mono oto ga kikoemasu---There is a strange noise coming out from the box.