学校に行かなければならなかった

Meaning
i had to go to school

Vocab used in this sentence

学校
school, academy
in, to, on, at, into, upon
行く
go, travel, move
ない
no, not, don't, without, missing, absent
if, by, should, when
なる
be, get, become, comes, to become
ない
no, not, don't, without, missing, absent
the, was, ta, da, other

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