兄弟は僕が失敗するといつもからかうんだ

Meaning
my brothers always tease me when i mess up

Vocab used in this sentence

兄弟
brother, brothers, sibling, siblings, brotherhood, fraternal
a, the, is, am, are, will
i, me, myself, servant, manservant
is, there, but, ga, will, however
失敗
failure, mistake, error, slip, setback, oversight, lapse, blunder
する
to, make, to do, to make, to perform, to conduct
and, with, if
いつも
always, every time, regularly, constantly, forever, habitually
から
from, at, because, out of, by, since, off, after
かう
say, buy, purchase, 2.2
i, n, m, ng, yin, hmm
is, be, are, am, it is, seems

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