求专业人士进:

问题描述:

求专业人士进:
是have been increased 还是have increased?两种用法我都看到过,是都可以用无区别还是有区别并且分不同的情况使用?
The production of grain has been increased by four times this year.为什么这里用have been increased?

这个有been的是被动式,要看你前面的这个主语是否能自动增长,这个要仔细体会的,
1.As bear's numbers have increased, conflicts with local people have also,
2.As temperature have increased in recent decades,
这两个都是自动增长没有被增长的意思.