She should put yellow handkerchief on the tree and I'd get off and come home.
她应该把黄手帕挂在树上，我就可以下车回家了。
2
I told her that if she didn't have a new guy and if she'd take me back, she should put a yellow handkerchief on the tree, and I'd get off and come home.
我告诉她，要是她没有别的男人，要是她还想让我回去，就在树上系一条黄手绢，我就会下车回家。
3
I told her that if she'd take me back, she should put a yellow handkerchief on the tree, and I'd get off and come home.