has been 比较级

没有比较级，是be的现在完成时，例如：

1、The present regime has been in power for two years.现政权已经执政两年了。

2、There has been a lot of resistance to this new law.这项新的法规已经遇到很多的抵制。

3、Only time will tell if the treatment has been successful.只有时间才能证明这种疗法是否成功。