문법 uses

기

Used to evaluate or judge something

밖에

Nothing but, outside of this I have nothing

아/어 있다

Indicates an action is completed, unless acted on the state does not change

기 때문에

Because I

는/은/인데

Background info and contrast

아/어도 되다

Approval or permission to do something

는 중이다

I am in the middle of something, only with action verbs

으면 안 되다

Can't/shouldn't/prohibition

기 위해서

In order to, to intend to

Can take all verbs but is formal

아/어 놓다

Completed a sequential action

기는 하지만

But, has to have contrast between the first and second statements

으 ㄹ 모르겠다

I'm not really sure

으 ㄴ지

It has been, express passage of time since an event or action

이 나

that many, typically an exaggeration