When Mary came to the river, the horse was standing there, h

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When Mary came to the river, the horse was standing there, head hung as if abashed.
为什么if 后面可以省略it was ? 这是什么语法规则?

as if the horse/it was abashed
当主句的主语和从句的主语一致且从句的谓语动词的一部分是be时,可以把从句的主语和be同时省略.
一般常用的时间状语从句,条件状语从句,让步状语从句等.
While crossing the street,you must be careful.
Although (we are) tired,we go on working.
If (I am ) invited,i will go there.

When Mary came to the river, the horse was standing there, h 一个英语句子,When the little horse began to cross the river,a litt A boy came to a river bank.The river was very deep and wide. when mother came in,Mary was playing the piano请问可以改为when mot when he was [ ] he went down to the small river There was a man standing in the room with__10__an apple in h Mary came up to see —— A What was the matter B what the matt The railroad accident was caused by a horse standing on the 高一英语单选Everybody was moved to tears when the film came to the He was a good swimmer so he -swim to the river bank when the when he was ___,he went down to the small river behind the f there is __ “h” in the word horse