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?
答
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.