hello,how are you=嗨,你好吗 pronounce as "hi,Lee How mah"
Ni Hao Pronounced (KNEE -HOW) or if to a group of people: Ni Hao Ma (Knee How Ma)
It's nǐhǎo in pinyin and 你好 in Chinese characters.
In Mandarin or Taiwanese, it's "Ni Hao"
Ni hao.
ni hao