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?
问题描述：
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?
答
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.