Sentence Structures (Subject and Verb) 

This video explains you about the structure of a sentence. A sentence must at least have 1 subject and 1 verb in a simple sentence, yet it could be also possible for a sentence to have more that 1 subject and 1 verb in more complex one. Study this example below:
Simple sentence
1. Alice teaches English in the university.
Alice = Subject (singular)
teaches = Verb/main verb (singular) ---- teach + es
English = object
2. Lions and Tigers are mammals.
Lions = Subject (plural) ----- Lion + s
Tigers = Subject (plural) ----- Tiger + s
are = Verb/ to be (Plural)
3. An American stays in the USA, while an Indonesian stays in Jakarta
An American = Subject (singular)
An Indonesian = Subject (singular
Stays = Verb/ main verb (singular) ----- stay + s
Basic sentence structure is ( Subject + Verb + Object)
Subjects and Objects stand as Nouns
Verbs can be in the form of main verb or to be.