新概念中的一句Theywereclimbingupthewallofthehouseandthenontotheleavesofthetree.为什么是ontotheleaves?可不可以是ontheleaves或者是totheleaves?为什么是comeontotheleaves而不是comeontheleaves或者

Question

新概念中的一句
They were climbing up the wall of the house and then on to the leaves of the tree.
为什么是on to the leaves?可不可以是on the leaves 或者是to the leaves?
为什么是come on to the leaves
而不是come on the leaves或者come to the leaves?

Answer 1

这个是一个并列句,即：They were climbing up the wall of the house and then they climbed on to the leaves of the tree.
to 有到达的意思