였습니다 grammar - yeossseubnida grammar

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Conjugating 이다 to the past tense is simple, and is done by connecting 이 to 었~. When the last syllable in a word ends in a vowel, 이 + 었 can combine to make 였
                          
Informal Low Respect




Add ~이었어 to all words. If the word ends in a vowel, ~이었어 can contract to ~였어.
나는 바쁜 선생님이었어 - I was a busy teacher
나는 학생이었어 - I was a student
나는 선생님이었어 - I was a teacher
Informal High Respect
This conjugation is the same as above (Informal Low Respect), except for that "~요" is added to the end of ~이었 or ~였. That is, you should add ~이었어요 to all words. If the word ends in a vowel, ~이었어요 can contract to ~였어요.
그것은 큰 비밀이었어요 - That was a big secret
저는 선생님이었어요 - I was a teacher
저는 의사였어요 - I was a doctor
Plain Form
Same as above, but you should add the regular "~다" ending instead of "~어요." That is, you should add ~이었다 to all words. If the word ends in a vowel, ~이었다 can contract to ~였다.
나는 선생님이었다 - I was a teacher
나는 의사였다 - I was a doctor
Formal High Respect




Add ~이었습니다 to all words. If the word ends in a vowel, ~이었습니다 can contract to ~였습니다.
저는 선생님이었습니다 - I was a teacher
저는 의사였습니다 - I was a doctor
In all situations in the past tense, 아니다 is conjugated just like any other word. An example of each respect:
나는 학생이 아니었어
나는 학생이 아니었다
저는 학생이 아니었어요
저는 학생이 아니었습니다
The weird thing is that Korean speakers sometimes would use these:
나는 학생이 아니였어
나는 학생이 아니였다
저는 학생이 아니였어요
저는 학생이 아니였습니다
Just going by the rules of the language, I'd have to assume that the first set is correct. I base this on the fact that in no other word do we add "~였~" to a stem. In other words, "~였~" is created from "이 + 었," but it is never added as a stand-alone thing.