I think I can / I don't think I can

*  I [don't] think I can  : ~할 자신이 있다 / 없다

I don't think I can do this

Do you think you can do this?

I don't think I can drive to Busan

I think I can finish on time

* confidence / confident : 행위랑 엮여있지 않은 "자신감"을 표현할 때

You need more confidence

You need to have more confidence

I don't feel confident

I don't have confidence