Most Chinese tutors or teachers say that they are native Mandarin Chinese speakers, but there are about 900 million native Chinese speakers. How do you know if they really speak with accurate pronounciation?

Hi maryt,

It's a great point. You could ask the instructor if they teach the bopomofo phonetic system.

Once you've learnt those tones for the 4 Chinese characters, you can begin expanding your vocabulary with the native pronunciation.