Rules for nasalization

When will the nasalization phenomenon occur? it happens when all vowels followed by nasal sounds [ m n ŋ ] will be nasalized.

Look at these examples below:
– in / ɪ̃n /
– man / mæ̃n /
– king / kɪ̃ŋ /
– bomb / bɔ̃mb /
– bean / bɪ̃ːn /
– jumpt /dʒʌ̃mp/
– want /wɔ̃nt/
– punch /pʌ̃ntʃ/
– thank /θæ̃ŋk/