Yes. For examples:
- (Cái) phà này lớn quá! -> This ferry is huge/This ferry is too big!
"Cái" is the most common classifier for things and objects: cái nhà (house), cái tô/bát (bowl), cái vườn (garden), cái răng (tooth), cái nón (hat), etc.
Ffs these words!! Ferry, Ferris wheel, the fish eats the bicycle Come on, when will the sentences make any sense??!
Its just teaching how to construct sentences together on your own. Sometimes you need learn some of the words in order to make sentences. Like the sentence "The fish eats the bicycle", it teaches you first the word fish, word eat, word bicycle, individually in order to learn how to put some words together in the sentence. Then you might learn quicker by then how do their sentence structure work.