/ɪ/ and /i:/

Pronounced as /ɪ/ when the sound is UNSTRESSED (usually -i, -y, -e)	Pronounced as /i:/ when the sound is STRESSED (usually -ee, -ea, -ie, -ei)
hit, kick, little, interest study, tidy, crystal event, experience, exist, effect, enough, especially because, become, begin, between	me, he, she, scheme athlete, complete, delete flee, agree, feed, feel sea, beat, cheat, dream believe, brief, niece perceive, receive

Special cases: English (/ɪ/), pretty (/ɪ/), business (/ɪ/), busy (/ɪ/), build (/ɪ/), women (/ɪ/), key (/i:/), quay (/i:/)