The greetings are also a problem for new comers to the United States.
Everybody knows when to use "Good morning," "Good afternoon," and "Good evening." But, some often do use "Good night" as a greeting expression "Good night" is a parting one, used in the eveing when one is expected not to see the other until tomorro. The word hello or (pronouncedhigh) is used between well acquainted persons like close friends or old neigsbors. The word hi is, however, silhtly more intimate tham hello.