biasanya is wrong. biasanya = usually.
this sentence means 'they had a lamp at their house, but now they don't have a lamp at their house'
maybe 'sebelumnya, mereka punya lampu di rumah mereka'
Katanya "used to have" = punya, so should be "Mereka punya sebuah lampu di rumah mereka." Trus knp disalahiiiinn??? Hikkss....
Used to itu kata lampau kalau di artika 'dulu' kalo ada have nya artinya (pernah )
used to have = pernah
Used to = dulu
Pernah itu kata lampau (past)