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.

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In1620,abouthalftheUSAwascoveredbyforests.此句子对吗?将by换成with行吗?我看到别处有用with的.可是becoveredwith与becoveredby

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.
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.

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.
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）

不能，句子的译为：1620年,美国约有一半的土地被森林覆盖着，很明显，by表被动，with不能代替。

此句根据句意，可以通用。
be covered with与 be covered by 这两个词语都有“由。。。覆盖”之意
with用于主动或被动语态均可，指“用。。。覆盖/掩盖”，表状态
by用于被动语态，引出动作的逻辑主语，表动作

是有区别，人工植树说明　人是动作的施动者　用with 自然界的树木树木是施动者用by
　

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