彼らは最初の電車に乗るために早く起きなければならなかった

Meaning
they had to wake up early to catch the first train

Vocab used in this sentence

he, his, him, boyfriend
la, ra, from, et al
a, the, is, am, are, will
最初
first, initial, beginning, initially, originally, scratch, outset, commencement
to, of
電車
train, electric train, rail
in, to, on, at, into, upon
乗る
ride, board, get on, get up, spread, join, mount
ため
for, due to, because, in order to, because of
in, to, on, at, into, upon
早い
early, fast, quick, premature
起きる
get up, to get up, to wake up, rise, happen, originate
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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