How to speak correct Chinese?

Chinese is most popular language in the world. Many New Yorker are learning Chinese. For the beginner, they has some problem in the in the tones. Chinese has four tones in the each word. "You must understand each tone because if you use wrong tone to speak a word it may has different meanings." The Chinese teacher David Liu Said. He is a Chinese tutor live in New York. David Liu provide one on one private tutor for people who want to learn Chinese. He said most of his student spent a lot of time in learning how to speak correctly Chinese. Espically in tone. "I need to design class to learn language easy and funny for each student" David said. "If they can learn Chinese well, they got ticket to the new world". He said student can use 80/20 rule to learn Chinese. For example, Chinese character has a lot of words. But if you learn about 700 key Chinese words. You can recognize most of Chinese characters in newspaper, books or TV.