They(mereka) all(semua) left(pergi) at the same time(bersamaan). We(kami) will(akan) all(semua) go(pergi) together(bersama) Indonesian sentence is Subject+Predicate/verb+Object+adverb. when one is missing so just move on, ex:S+P+adverb. all--> semua (put after S) kalian ("you" but informal) sekalian( ...all, it is put after S to say "S" as unity. "you all"-->kamu sekalian(too formal and konvensional) kamu semua( "you all" but informal) semuanya (all) but it can't be united with Noun/object. X: which t-shirt do you like? Y: "semuanya" or you say "semua" t-shirt. *semuanya: all (not united with noun/object) semua: all+Noun/object--> (semua......) I hope it helps you

Kalian = kamu semua : You all (you, but for more than one person) Sekalian: To do something at the same time. Also. - Kalau kau pergi, sekalian bawa tasmu -> If you leave, (at the same time) bring your bag) - Saya jalan-jalan, sekalian mencari makan - I am taking a walk, (at the same time) looking for food. 'Semua' and 'semuanya' are the same. But for saying "all of it /all of them" we often use 'semuanya'. But it doesn't really matter if you want to use 'semua'. - Semuanya bergembira --> all of them are happy (but you can also say 'semua bergembira', it doesn't really matter). - Semuanya milik kita --> all of them are ours (you can also say 'semua milik kita', it doesn't matter). Actually, there is a little bit differences between 'semuanya' and 'semua' in two sentences above. But it's not quite important. Semuanya : all of them (so 'them' here is specific for certain people/objects). Semua: all (not specific for certain people/objects)

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they mean (mereka) but this "mereka" is too broad, so we use 'all' that mean "semua" to explain that situation in one place. left at the same time, it's mean "meninggalkan/pergi di waktu yang bersamaan" the meaning of this sentence is to explain that Subject left the Object in same time. 'we all will go together' mean "kita semua(all) akan pergi bersama"

Mereka semua meninggalkan pada saat yang sama. kita semua akan pergi bersamasama