Why the people change so fast?这句话正确吗?

Why do you know the boy are running so fast 这句话的结构 why do you change so fast?which one is you? 英语翻译i change the langugue l'm so tirred这2句话语法正确吗如果不正确 这2句话的意 I rode the bike so fast as Icould.这句话有错吗? Why did you decide it so fast? why people like to think more That is why fast food is so popular in North America.People Don't know why people become so fast .Friends do not cross t why people don't like the rainy day?这句话有错吗 why so many people like Bigbang?这句话有没有语病 Because the bus goes too fast,so we sannot.这句话哪项错了,怎么改 Why people attend college?这句话有语法错误吗? why is the man running so fast 改为同义句 ____is the man running