Let's learn about "그건 쓸데 없다"

그건 쓸 데 없다 : It's useless

[other expressions]

- 그건 쓸 데 없다. (to younger people or friends)

- 그건 쓸 데 없네. (to younger people or friends)

- 그건 쓸 데 없어. (to younger people or friends)

- 그건 쓸 데 없는데. (to younger people or friends)

- 그건 쓸 데 없네요. (honourific by '요')

- 그건 쓸 데 없는데요. (honourific by '요')

- 그건 쓸 데 없어요. (honourific by '요')

- 그건 쓸 데 없습니다. (formal; more honourific by '스')

[explanations]

* 그건 : a short form of 그것은

* 그것 : that (thing); it

* -은 : a particle makes 그것 subjective after a word ends in a consonant

* 쓰다 : use

* 쓸 : 쓰(the stem of 쓰다) + -ㄹ(a suffix makes a verb future tense and attributive form)

* 데 : [=곳] place

* -가 : a particle makes 데 the topic of the sentence after a word ends in a vowel; this omitted

* 없다 : do not exist; there is no...

* 쓸 데 없다 : be useless

* 쓸 데 없는 : useless

* 없습니다 : 없(the stem of 없다) + -스(a suffix makes a verb more honourific) + -ㅂ니다(an honourific descriptive verb ending suffix by '-ㅂ')

* a verb + -다 / -네 / -어 / -는데 : a non-honourific descriptive verb ending suffix

* a verb + -네 / -는데 + -요 : an honourific verb ending suffix

* a verb +  -습니다 / -ㅂ니다 : an honourific descriptive verb ending suffix by '스'' / '-ㅂ'