There is a bird in the tree.为什么是用in,不能用on,

There is a bird in the picture.的问句是什么? There is a bird in the tree 改为一般过去式 There is a bird fly in the sky改错 there is a bird in the tree变为复数形式 There is a bird in the tree. 对 a bird 划线提问 there is a bird in the sky 还是 there is bird in the sky那句对? A bird is in i____mouth. Look,there is a bird（）that tree.A in B on C atLook,there is a bird（）that tree.A in B on C at 英语There be 句型后面必须接介词短语吗例如:There is a bird in the tree有没有there is a bird.这样呢? In the tree there is a bird .可以改为:There is a bird in the tree .这2句有什么区别? There is a bird in the tree.为什么用In.能不能用on. There is a bird in the tree.为什么是用in,不能用on, There is a bird in the tree .It is s[ ].填单词 ( )you see a bird in the picture?This is a picture ( )my school.There is a river ( )there. There is a bird in the sky.A.fly B.flying C.flies D.to fly There is a bird ( ) the tree.A.at B.on C.in D.above 连词成句:is,there,bird,a,the,in,tree.不是问句! 用in,a,bird,is,tree,the,there连词成句子