Syntax: The sentence 'Looks like we made it' uses an informal contraction of 'It looks like...' The verb 'made' is in the simple past tense, indicating a completed action. The imperative 'Look how far we've come' is a command to observe, with 'we've come' being the present perfect tense, connecting past action to the present result.
Morphology: 'Made' is the irregular past tense and past participle of 'make.' 'We've' is a contraction of 'we have.' The '-ing' in 'holding' (from later lines) is a present participle used in the progressive aspect.

Syntax: 'We might've took the long way' uses the modal verb 'might' + perfect infinitive ('have took' - though 'taken' is standard) to express a past possibility. 'We knew we'd get there someday' features a reported clause ('we'd get there') following the past tense verb 'knew.' 'We'd' is a contraction of 'we would.'
Morphology: 'Might've' is a contraction of 'might have.' 'Took' is used here informally for the past participle 'taken.' 'Get' is in the base form after the modal 'would.'

Syntax: The line 'They said, "I bet they'll never make it"' uses direct reported speech within quotation marks. 'But just look at us holding on' is an imperative sentence starting with the coordinating conjunction 'But.' 'We're still together, still going strong' uses the present progressive 'are going' with the adjective 'strong' as a subject complement.
Morphology: 'They'll' is a contraction of 'they will.' 'Holding' is the present participle of 'hold.' 'Going' is the present participle of 'go.'

Syntax: The repeated structure 'You're still the one' uses 'the one' as a noun phrase meaning 'the person.' The following lines ('the one I run to...') are noun phrases in apposition, defining 'the one.' They omit the relative pronoun 'that/whom' (e.g., 'the one *that* I run to'). 'I want for life' uses 'for life' as a prepositional phrase acting as an adverbial modifier.
Morphology: 'You're' is a contraction of 'you are.' 'Belong to' is a phrasal verb. 'Want' is in the simple present tense.

Syntax: 'Ain't nothin' better' is a double negative used informally for emphasis, meaning 'There is nothing better.' 'We beat the odds together' uses the simple past tense. 'I'm glad we didn't listen' uses the past tense 'didn't listen' in a subordinate clause. 'Look at what we would be missin'' is a second conditional structure imagining a present/future unreal situation (if we had listened).
Morphology: 'Ain't' is a non-standard contraction for 'isn't' or 'aren't.' 'Nothin'' is an informal spelling of 'nothing.' 'Beat' is the irregular past tense of 'beat.' 'Missin'' is an informal spelling of 'missing,' the present participle of 'miss.'