When do I use 'zài (在)' or 'shì (是)'？ I think I keep getting zài and shì mixed up when trying to form sentences. I have been trying to find a simple explanation for the correct place to use each of these words. Am I correct thinking that zài is used followed by a verb, and shì is used followed by an adjective? Are there any exceptions or is it the same in all cases? Here are some of my really basic attempts are forming sentence (unsure if they are correct): 1. Tā men shì nán rén. (他门是男人） 2. Wǒ shì nán hái. （我是男孩） 3. Táo shì shuĭ guǒ. （桃是水果） 4. Wǒ zài chī shuĭ guǒ.（我在吃水果） 5. Tā men zài chī táo. （他门在吃桃）