Are the children tired or thirsty ,这句话中开头为何是are,are在开头都有那些用法

where are the children? Why are the children The children are playing games. the children is 还是are Children are what the mothers are. “children are what the mathers are The children are wearing beautiful clothes.　　The children are_________beautiful clothes. The children are water the trees. The children are water the trees对吗? The children are _______ at the beach. hou nice children they are!的children前要加the吗 These are the（ ）（ children ）books. what are the children doing是什么意思啊好急呀 The children are working hard.改为感叹句. The children are very happy改为感叹句 where the ether children are的意思 where the ether children are快 The children are playing___(happy)over there.