"The clock does not have a battery."
Translation:Đồng hồ không có pin.
Just DUO, I am begging you, please explain--as in spell out plainly--WHEN AND WHERE TO USE CLASSIFIERS, AND "A/AN." It just seems so arbitrary. I mean, I thought I discovered they're not used much in the object part of the sentence, but then sometimes they are, and there doesn't seem to be any rhyme nor reason to when they are and when they're not! But there must be, right? SO PLEASE TELL US!!!! And if there actually isn't rules for it, then tell us that too, so we know! So here in this sentence, we have both the subject and the object without a classifier, AND you use "a" without using "mot." !!!!! Just, WHY?!?