Syntax: Complex sentence structure with "whenever" introducing a subordinate clause of time. "All I have to do" is the main clause with "is dream" as the complement. "When I want you" is an adverbial clause modifying the entire thought.
Morphology: "Whenever" is a compound relative adverb. "Charms" is a plural noun meaning attractive qualities. "Dream" is used as a bare infinitive after "to do" (ellipsis of "to").

Syntax: Parallel structure with "when" clauses. "When I feel blue" and "when I need you" are adverbial clauses. "To hold me tight" is an infinitive phrase explaining the purpose of needing the person.
Morphology: "Blue" is an adjective describing emotional state (sadness). "Tight" is an adverb modifying "hold." "Whenever" functions as a conjunction introducing a time clause.

Syntax: "I can make you mine" uses modal "can" for ability. "Taste your lips of wine" is metaphorical language. "Only trouble is" introduces a contrasting statement. "Gee whiz" is an interjection expressing frustration.
Morphology: "Mine" is a possessive pronoun. "Anytime" is a compound adverb. "Dreamin'" is a contracted form of "dreaming" (present participle). "Away" functions as an adverb particle in the phrasal verb "dream away."

Syntax: "I need you so that I could die" uses "so that" to show result/purpose. "And that is why" introduces a conclusion or explanation. The structure emphasizes cause and effect.
Morphology: "Could" is the past tense of "can" used here for hypothetical situations. "Why" is an interrogative adverb used as a conjunction. "Dream" is repeated for emphasis (anaphora).