He has answered the telephone.这里加has与不加has有什么区别?

He has answered the telephone.这里加has与不加has有什么区别? he has just answered the telephone I (had) answered the telephone.加had与不加had有什么区别? the photo looks beautiful这里的look为什么加s 还有He has a great sport has been 与has+动词过去分词有什么区别 The film has bugun since 30 minutes ago.这里has后不用加been吗 so he has 和so has he 什么区别 He has lived in the small house____ 30years..加什么? He has been there for six months.has been后面为什么不加to?还有为什么要加fo What has he bought?回答加意思 这里为什么用过去完成时?has been an in valid?has been +过分和has+过分有什么区别? He has opened the door.和He opened the door.有什么区别?