has been 加動詞原型是什麼時態

雙語例句：

1、The present regime has been in power for two years.

現政權已經執政兩年了。

2、There has been a lot of resistance to this new law.

這項新的法規已經遇到很多的.抵制。

3、She has been to China.

她去過中國。

4、Only time will tell if the treatment has been successful.

只有時間才能證明這種療法是否成功。

5、The software we use has been modified for us.

我們使用的軟體已按我們的需要作過修改。