YOU ARE POURING WATER.为什么要有个ARE

Be careful when you are pouring hot water __the glass That paper factory are pouring d__ water into the river 英语翻译people are pouring polluted water into the river,which w 英语句子“The chemical factoties are pouring waste water into the I am younger than you are 为什么加个are? 英语翻译water 助理,Are you really sure? - what are you doing?- drink water. you are my earth air water Look,there are several chemical factories pouring waste wate you 为什么+ are If you are ill you must____(drink)much water Are you happy now为什么用Are