Does pergi also mean went?
Yes. Generally "pergi" is translated as "go/went".
Since dozen is a real word in Bahasa, can we say "dozens of times" like in English?
Yes, you can say "lusinan kali" but it's very uncommon. It's more common to say "puluhan" to refer to a number between 20 and 99.
Yeah... No direct translation here. A dozen of anything is not common. Go to the supermarket and buy eggs, and they come in 6 packs, 10 packs, or a flat of 36. Dozen is not commonly used.
why can’t we leave out “pergi” in this sentence while in another lesson “they left home namun mereka tidak ke sekolah”?