Let’s learn about "-니까"

하고싶으니까 : Because I want to do it

[other expressions]

- (이유야) 하고싶기 때문에.

- (이유야) 하고싶기에.

- (이유야) 하고싶으니까.

- (이유야) 하고싶기 때문에요. (honourific by ‘-요’)

- (이유야) 하고싶기에요. (honourific by ‘-요’)

- (이유야) 하고싶으니까요. (honourific by ‘-요’)

- (이유야) 하고싶기 때문입니다. (formal; honourific by ‘-ㅂ’)

[explanations]

* 이유 : reason

* -야 : a particle makes 이유 subjective after a word ends in a vowel; this can be replaced by -는

* 하다 : do

* 하고 : 하(the stem of 하다) + -고( a connection suffix between two verbs)

* 싶다 : [as the form of -고 싶다] hope; want

* 하고싶다 : want to do; this is a word from "하고 싶다”

* 하고싶기 : 하고싶(the stem of 하고싶다) + -기(a suffix makes a verb a noun)

* 하고싶기에 : 하고싶기 + -에(a a non-honourific descriptive verb ending suffix emphasze 때문; this means "for; because; since")

* 하고싶으니까 : 하고싶(the stem of 하고싶다) + -(으)니까(a a non-honourific descriptive verb ending suffix means "for; because; since")

* 때문 : because (of); a space should be inserted between a noun and 때문

* -이다 : be

* 때문입니다 : 때문 + -이(the stem of 이다) + -ㅂ니다(an honourific descriptive verb ending suffix by ‘-ㅂ’)

* 때문에 : 때문 + -에(a non-honourific descriptive verb ending suffix emphasze 때문; this means "for; because; since")

* -에 / -니까 + -요 : an honourific suffix