be always doing与always doing有什么区别?是i always reading book?还是i am always reading book?还是 i always read book?这都有什么区别啊.都搞糊涂了.

be always doing ( 经常做某事,伴有语气,感情色彩在内）
例如：He is always talking in class.（他总是在课堂上说话,伴有讨厌的语气,上课不能老是说话哦）
always do 经常做某事,无明显感情色彩在内 (没有always doing)
例如：I always play football after school.放学后我经常踢球.