Usages of sseoya hada
비가 오면 우산을 써야 해요.biga omyeon usaneul sseoya haeyo.
If it rains, you have to use an umbrella.
지금 컴퓨터를 써야 해요.jigeum keompyuteoreul sseoya haeyo.
I have to use the computer now.
Elon.io is an online learning platform
We have an entire course teaching Korean grammar and vocabulary.