Syntax: The structure 'I wanna be with you' uses the contraction 'wanna' for 'want to'. This is a common informal structure expressing desire. 'Baby' is a term of endearment used as a vocative (direct address). The declarative sentence 'I wanna be with you' has a subject ('I'), a verb phrase expressing desire ('wanna be'), and a prepositional phrase ('with you') indicating the object of the desire.
Morphology: 'Wanna' is a phonological contraction of 'want to', common in informal spoken English. The base verb 'be' is used in its infinitive form after 'want to'. 'You' is the object pronoun. 'Baby' is a noun used as a term of endearment.

Syntax: This is a compound sentence. The first clause 'I wanna be with you 'cause my love is true' uses the conjunction ''cause' (a contraction of 'because') to introduce a reason. The second independent clause 'There's so many things that I wanna do' uses 'there is' (contracted to 'there's') as an existential clause introducer, followed by the subject 'so many things' and a relative clause 'that I wanna do' which modifies 'things'.
Morphology: 'Cause' is a contraction of 'because'. 'There's' is a contraction of 'there is', though it is followed by a plural noun phrase ('so many things'), which is common in informal speech. 'True' is an adjective describing the noun 'love'. 'Wanna' is again used as a contraction. 'Do' is the base form of the verb used in the infinitive phrase 'to do'.

Syntax: The first part 'I wanna be with you every night and day' adds a temporal adverbial phrase ('every night and day') to specify the desired duration. The second part 'Oh, baby, oh, baby, please stay' is an imperative sentence. 'Oh, baby' is an interjection and direct address, and 'please stay' is a polite command using the adverb 'please' to soften the imperative verb 'stay'.
Morphology: 'Every' is a distributive determiner used with the nouns 'night' and 'day'. 'And' is a coordinating conjunction. 'Oh' is an interjection expressing emotion. 'Please' is an adverb used to make a request polite. 'Stay' is the base form of the verb used in the imperative mood.

Syntax: 'Hit it, hit it, get straight with it' are informal imperative phrases likely meaning 'start the music/energy' and 'be direct'. The sentence ''Cause when I see you, girl, you know you make me go wicked' is a complex sentence. The subordinate clause ''Cause when I see you, girl' introduces a condition. The main clause 'you know you make me go wicked' has 'you' as the subject, 'make' as the causative verb, 'me' as the object, and 'go wicked' as the bare infinitive complement. 'But back to the point and you know we keep movin'' is a compound sentence fragment. The final line 'I wanna be with you 'cause my heart is still groovin'' returns to the main theme with a new reason.
Morphology: 'Hit it' is an informal phrasal verb. 'Get straight' is a phrasal verb. 'Wicked' is an adjective used in slang to mean 'excellent' or 'intense'. 'Groovin'' is a present participle (from 'groove') used informally to mean 'feeling good' or 'being in sync with music/emotion'. The '-in'' ending is a colloquial reduction of '-ing'.

Syntax: 'If you wanna be with me' is a conditional clause. 'So, come on, let me know, oh, baby' is the main clause, an imperative encouraging a response. 'Whenever you needed me' is a subordinate adverbial clause of time. 'My love will be right here, oh, baby, oh, yeah' is the main clause, a future simple declarative sentence promising availability.
Morphology: 'If' is a subordinating conjunction introducing a condition. 'Come on' is a fixed phrase used as an encouragement. 'Let me know' is a causative structure where 'let' is followed by an object ('me') and a bare infinitive ('know'). 'Whenever' is a compound relative adverb. 'Needed' is the past simple form, though in this informal context it might be used for present/future hypotheticals. 'Will be' is the future simple of 'be'. 'Right here' is an adverbial phrase emphasizing location.