as long as,so long as
You can keep the book as long as you like。这本书你爱看多久就看多久。
During the holidays，I like to stay in the countryside as long as I can.
As long as you tell the truth，I’ll try to help you. 只要你告诉我实情，我会尽力帮助你。
You may take this book away so long as you return it on time.
So long as the weather is changeable these days,we’d better get in wheat in time.
So long as you are going to town, you can do something for me.