In 1620,about half the USA was covered by forests.此句子对吗?将by换成with行吗?我看到别处有用with的.可是be covered with 与be covered by不能通用,有点晕.

Question

In 1620,about half the USA was covered by forests.此句子对吗?
将by换成with行吗?我看到别处有用with的.可是be covered with 与be covered by不能通用,有点晕.

Answer 1

我认为这个句子没错,在这里 by也可以换成with.当然be covered with 与be covered by不能通用,be covered by ...:由...承担/负担/支付;被...掩护/报道/监视/控制等等,表示抽象的概念,后面接人,机构,或者组织.eg.These expenses are covered by the state.(这些费用都由国家负担.)
All road out of town has been covered by the police .(所有出城的道路都被警察监视.)
be covered with\by ...:被...覆盖,表示具体的覆盖.如被雪/草地/布/被子/盖子/罩子等东西盖住.eg.
The furniture was covered by a lot of dust.(家具上满是灰尘.)
be covered with moss(长满绿苔)
be covered with snow all the year round(终年积雪）