rewrite sentences 1-4 without changing the meaning.Use the present perfect or the past perfect.
1.My uncle lives in California.He moved there ten years ago.7
My uncle.for the years
2 Isaw a shark for the first time two years ago/.
I .until two years ago.
3 Steve Fossett was the first person to fly around the world without stopping.
Before Steve Fossett,no one,...
4,My family has holiday home.We hought it two years ago.
We...for two years.
能顺便说一下这2个的区别吗?还有为什么要用这个~