Hindi Uses Two P's — English Secretly Does Too

In Hindi, प (p) and फ (ph) are two completely different sounds, and you choose one or the other on purpose. English also has two versions of p, t, and k — but here, the puff of air isn't a separate letter, it's an automatic rule: strong puff at the start of a word ('pin'), no puff after s ('spin'), and often little puff at all in the middle of a word. Because this isn't marked in spelling, many Hindi speakers under- or over-aspirate without realizing it. Try this: hold a tissue in front of your mouth and say 'pin' — it should flutter strongly. Now say 'spin' — the flutter should almost disappear. Practice the pair 'pin/spin' and 'top/stop' this way for two minutes. You already have the muscle control from Hindi; you're just learning where English hides the rule.