Usages of sai
책상과 의자 사이에 컴퓨터가 있어요.chaeksanggwa uija saie keompyuteoga isseoyo.
There is a computer between the desk and the chair.
의자 사이에 연필이 떨어져 있어요.uija saie yeonpiri tteoreojyeo isseoyo.
A pencil is lying between the chairs.
Elon.io is an online learning platform
We have an entire course teaching Korean grammar and vocabulary.