(click 'Dictionary' if you want to be directed to Oxford Dictionary)
Compound Subject: When two or more subject are compounded in a sentence.
Adverbial Phrase: A group of words that act together as an adverb, giving more information about a verb, adjective, or other adverb in a sentence.
Determiner: Function like adjectives and are use before nouns. It can't stand alone and has always been mistaken as pronouns.
Relative clause : To identify the things or people you mention by adding a fact about them.
Dependent clause : A group of words that has both a subject and a verb but cannot stand alone as a complete sentence, because it does not express a complete thought.