You can practise Czech grammar and pronunciation here.

Czech Drills

Today we are going to learn how to say hello in Chinese. You will definitely find this in all Chinese textbooks. Hello in Chinese is 你好 nǐ hǎo. 你 means you，好means good，so 你好together also means wish you well, which shows our sincere and best wishes to people we meet. 

In everyday life, we use this expression to greet people, but usually to someone who is not our close friend or family member. You can use 你好 nǐ hǎo to greet your co-workers, someone you have just met. 

rú ɡuǒ nǐ jiàn dào le nǐ de hǎo pénɡ you ， nǐ duì tā shuō nǐ hǎo ， tā huì jué dé yóu diǎn qí ɡuài 
如 果      你 见   到  了 你 的 好  朋   友  ，            你 对  他 说   你 好  ，   他 会  觉  得 有  点   奇 怪   。 
It would sound a bit strange if you met and greeted your close friend with "你好 nǐ hǎo". 