The subject is the main body of a sentence, usually at the beginning of the sentence. All words, phrases, clauses and even sentences can be used as subjects.
Predicative poems describe the actions, characteristics or possible states of the subject, which are usually located after the subject.
The object indicates the object of the action or the receiver of the action. The object usually comes after the transitive verb. "Subject+Predicate+Object" is the normal word order of declarative sentences containing transitive verbs, and the preposition object is generally located after the preposition.
Attributes are used to modify nouns or pronouns. State, quality, quantity, etc. Of a person or thing.
Adverbials modify verbs, adjectives, adverbs and the whole sentence, explain the characteristics of an action or state, or supplement a certain characteristic.
Complement is a supplementary explanation.
I suggest you buy a grammar book and do more exercises to make it clearer.
I hope I can help you.