1)七月份你们再来时,他们就搬进新房子里去了。
When you come again in July, they will have moved into a new house.
2)到下一个五一节,我们在一起的时间就很长了。
By next May Day we shall have been together for a long time.
3)我相信,在你到那儿之前,这些困难他已经解决了。
I’m sure he will have settled/solved the difficulties before you arrive there.
4)到明年七月,我就大学毕业了。
By July next year, I will have graduated from college.