I'm also trying to learn Urdu and I know there must be a few differences but in urdu is "tum". Would both, tu and tum, be correct here in Hindi? And in Duo555555 comment ends with "he" and this exercise with "hai". Is it because: तू _है and तूम _ हो? Isn't there "ho" here?
'Tu' is too much of rude word when talking to stranger but you could use it with close friend its like you can't say "hey you bastard" to stranger but its common in friends intead we can use "tum" to friends or same age person for respective and elderly person we use "aap" it work as Word "sir you" in english we you as "तू" as rude word *It is like you are downgrading someone #dont use this word unless you are soo much pissed some could get an idea that you are disrespecting them.
"तुम" for same as person or smaller than you.
"आप" for respected elderly and new or stranger person