They look cool 怎么变一般疑问句?

变为：Do they look cool?
陈述句变疑问句一般分两种情况：
1,句中有be（am,is,are,was,were）动词时,直接把be动词提到最前面,例如：
He is a college teacher.变为一般疑问句是：Is he a college teacher?
2,句中没有be动词时,根据时态、语态的不同,借助于助动词do,does,did,例如：
She went to swimming last week.变为疑问句：Did she go to swimming last week?(注意这里went 还原,因为do是助动词).希望对你有用.