私たちは家を掃除しなければなりませんでした

私: i, my, me, i am, myself, private
たち: we, their, ours, -s, group of
は: a, the, is, am, are, will
家: house, home, family, building, residence, dwelling, residency, habitation
を: o, the, to, wo
掃除: cleaning, vacuum, sweep, sweeping, cleanup, sweeper
し: and, shi, four, death
ない: no, not, don't, without, missing, absent
ば: if, by, should, when
なり: be, become, makes, quite, as soon as, pretty
ます: will, to be, i will, to make, to do, to have
ん: i, n, m, ng, yin, hmm
です: is, be, are, am, that, away
た: the, was, ta, da, other