is surrounded by beautiful woods.I live in a very old town which is surrounded by beautifulwoods.为什么which 后面是is

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is surrounded by beautiful woods.I live in a very old town which is surrounded by beautifulwoods.为什么which 后面是is
is surrounded by beautiful woods.
I live in a very old town which is surrounded by beautifulwoods.
为什么which 后面是is

is surrounded by beautiful woods.I live in a very old town which is surrounded by beautifulwoods.为什么which 后面是is
I live in a very old town which is surrounded by beautifulwoods.
我住在一个被美丽树木环绕的非常老的镇子里.
主句I live in a very old town
which is surrounded by beautifulwoods.是定语从句,修饰town
定语从句which is surrounded by beautifulwoods.采用了被动结构,因为是树木环绕镇子,而镇子只能被环绕,所以采用了be+done的一般被动语态,就是本句的is surrounded

被美丽的树林环绕

前面是一个冠词a which 指代前面的a small town 而主语是单数所以用is ,

这是一个定语从句。town 是主句的宾语,which从句是定义town的,这个镇子被...所环绕,从句用的是被动语态,镇子,相当于“它”,当然是单数。
谢谢!