Thank you so much ahmed
But here
I think u mean "Ain't" not "Init"
and it is used for
Am not = I ain't going
Is not = She ain't young
Are not = You ain't happy
Has not = He ain't got anything
Have not = They ain't had dinner yet
And sometimes
Do not = I ain't know
Does not = She ain't smoke
Did not = I ain't go to my office