1.I found a dog ____ over by a car the road.A.to run B.run C.ran D.running为什么选B?选D不行吗?2._____ carefully,this letter is very beautiful.A.Type B.Typing C.Typed D.To Type为什么要选C?命令语气不应该用原型吗?3.The vacation ____ over ,the students came back to school.A.is B.are C.was D.being 这道题选D,选C不可以吗?4.______,we left off our work.A.After setting the sun B.Having set the sun C.The sun having set D.Being the sun set为什么?选B不可以吗?

问题描述:

1.I found a dog ____ over by a car the road.
A.to run B.run C.ran D.running
为什么选B?选D不行吗?
2._____ carefully,this letter is very beautiful.
A.Type B.Typing C.Typed D.To Type
为什么要选C?命令语气不应该用原型吗?
3.The vacation ____ over ,the students came back to school.
A.is B.are C.was D.being
这道题选D,选C不可以吗?
4.______,we left off our work.
A.After setting the sun B.Having set the sun C.The sun having set D.Being the sun set
为什么?选B不可以吗?

楼上正解。第三题的话,一个句子中两个谓语的话,必有一个连词,此处无连词,A、B、C排除

上楼回答正确

1、这里意思是“我看到狗被一辆车撞了”,应该用被动句,首先排除AD,run/的被动式是run,所以选B
2、此处是说这信被处理得很仔细,很漂亮,应用被动态,并非命令
3、the vacation being over是从句,如果用was的话,则应该改成The vacation was over and the students came back to school.
4、如果选B的话,动名词作主语,照理说两个分句的主语应一致,但此处是不可能的,选C的话是从句

1、狗被撞,是被动关系,所以非谓语用过去分词
2、this letter和type是被动关系,同上。这句话并不是祈使句!
3、如果选C ,一句话里就有两个谓语动词,这种情况下要么加连词,要么用非谓语,所以用be动词的进行时态。
4、同上····
注:你可以多看一下语法书上关于非谓语这一块儿的,你问的题应该都可以解决了