Let's learn about "보고 싶었어"

보고 싶었어 : I missed you

[other expressions]

- 보고 싶었다. (to younger people or friends)

- 보고 싶었네. (to younger people or friends)

- 보고 싶었어. (to younger people or friends)

- 보고 싶었네요. (honourific by '요')

- 보고 싶었어요. (honourific by '요')

- 보고 싶었습니다. (formal; more honourific by '스')

[explanations]

* 보다 : see; look; watch

* 보고 : 보(the stem of 보다) + -고(s connection suffix between two verbs)

* 싶다 : want; hope

* -고 싶다 : want to see

* 싶었다 : past tense of 싶다 by '-었-'

* 보고 싶다 : (1) I miss someone (2) I want to see someone/something

- 그걸 다시 보고 싶다 : I want to see it again

- (나는) 그녀를 미치도록 다시 보고 싶다 = (나는) 그녀가 미치도록 다시 보고 싶다 : I am dying to see her again

* -가 : this is used instead of -를; a particle makes 그녀 the topic of the sentence after  word ends in a vowel

* 싶었습니다 : 싶었(the stem of 싶었다) + -스(a suffix makes a verb more honourific) + -ㅂ니다(an honourific verb ending suffix by ‘-ㅂ’)

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

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

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