He is in China,为什么要加is

He is in China,为什么要加is ____now he is in China . Now he live in China with his parents中的live为什么不加slive可以改成lives或is吗？ The Yellow River is the second longest river in China为什么要加the china is a nice place [ to live ] in 为什么要加to China is larger than any country in Asia.为什么错如果是China is larger than any other countries in Asia.为什么要加other才正确? he comes from china为什么come要加SIcome from china 就不用加 But these days he is in trouble.为什么加in I have just arrived in China为什么要加 have I was born in China.为什么要加was i am in China为什么要加am They live in China 还是~··They lives in China I live in China.He lives in China.第一人称不用加S 第三人称要加S 那They 要不要加S 英语问题He was born in China为什么不用is用was He is used to ____(live) in China.为什么,谢了 The devolopment of agriculture is of great siginificance in China.为什么这句话不能写成这样呢The devolopment of agriculture is great siginificance in China.为什么中间要加一个of呢? China is larger than any country in Africa,country为什么不加s he is living in china now.he lives in china.这两句哪个对? The weather in China is nearly the same as ____ in USA 要不要加that