what are they on 中 on的用法.这是一段对话老师：我们将学习3种方法.学生：what are they on 这里 为熟嘛能用ON 能再来个类似的句子么?

是What on earth are they looking at?还是What on earth they are looking at? what are they on 中 on的用法.这是一段对话老师：我们将学习3种方法.学生：what are they on 这里 为熟嘛能用ON 能再来个类似的句子么? they are on sale f( ) eight o'clock They live on,even when we're gone.What Are What are they doing now? They_(put)on their clothes. 猜猜是什么英语单词?they are green .they are not hravy.they are on three,children.sometimes collect them beause they are pretty .what are they? when we put on them,they are full.but they are empty when we dont use them.what are they? 请问what are on the desk?they are some apples on the desk.有语法错误吗? what are they What are they? What are they doing? what are they doing? what nice they are What are they What are they? What are they? What islands are they? what are they!