It looks as if well be late. 中的 be 动词

去掉 be 是错误的，但为何必须要加上 be，这是哪条语法规则呢？

It looks as if well be late. 中的 be 动词

去掉 be 是错误的，但为何必须要加上 be，这是哪条语法规则呢？

回答如下：

As if 引导表语从句，主句用通常目前时态，从句用通常以后时态

主语：It

系动词：looks

引导表语从句连词：as if

从句主语：we

从句谓语：will be

从句表语：late

以上句子是由as if连词引导表语从句,as if除去引导表语从句还可以引导方法状语从句

【1】假如放在行为动词后则是引导方法状语从句

She loves the boy as if she were his mother．她爱这个男生仿佛她是他的母亲一样.

The child talked to us as if he were a grown-up．这个孩子和大家说话仿佛是一个成年人.

【2】假如放在系动词后则是引导表语从句

She looks as if she were ten years younger．她看着仿佛她年轻了10岁

It seems as if our team is going to win．仿佛大家队会赢

【1】假如表示与事实相符，用陈述语气

She looks as if she is going to cry.她看着仿佛要哭了.

【2】假如表示与事实不相符，则用虚拟语气

比如：I remember the whole thing as if it happened yesterday.我记得整个状况仿佛是昨天发生的一样