关于surround（包围）的用法.Thecitybytheenemyforzboutamonth.这里的空填的是wassurrounded.PeoplesayitisCanada'smostbeautifulcity,surroundedbymountainsandthePacificOcean.这里的不是被动语态吗?

Question

关于surround（包围）的用法.
The city ________by the enemy for zbout a month.
这里的空填的是was surrounded.
People say it is Canada's most beautiful city,【surrounded】by mountains and the Pacific Ocean.
这里的不是被动语态吗?为什么前面不加be动词?
还有这句,Vancouver 【surrounded】 by mountains and the Pacific Ocean.也为什么不用be动词呢?

Answer 1

1、
The city was surrounded by the enemy for zbout a month.是被动语态；
2、People say it is Canada's most beautiful city,【surrounded】by mountains and the Pacific Ocean.
可以看作是“被动语态,但中间省略了一个“ is ”——因为前面已经有一个了；也可以看作是过去分词短语作状语,说明伴随的状况,这样也无须加be.
3、“Vancouver 【surrounded】 by mountains and the Pacific Ocean”是过去分词短语作定语,所以不加be.但,所有“过去分词”+“by”这样的短语都含有被动的意思.