Let's begin at once,it's already late.

来源：学生作业帮编辑：作业帮分类：综合作业时间：2024/07/09 00:36:09

Let's begin at once,it's already late.
我们马上开始吧,已经晚了.
Let's begin at once这句的主语是什么啊?
at once是做什么的?
不要it's行吗?
because i don't know.

It's already late
这里的it功能和it's raining/it's Monday等句型一样,这些都是'无主语句",it除了是代词'它'的含义,还一个功能就是补充担当无主语句的'主语'.只有语法功能,不代表其它的含义.（有点象占位符)
Let's begin at once
at once=right away.
这是祈使句,也是无主语句.
字典:
used in the normal subject position in statements about time, distance, or weather. (上面的例子)

Let's begin at once,it's already late. Let‘s go at once,()we'll be late. It's ( ) dark .Let's go home at once Let's start at once,or we'll be late for the meeting Jim!Let's go to school at once .We'll late. When it's late at when they finish their homework,it's already late at night同义 Let's begin our It's too late now ,Anna _____（have）to go home at once It‘s very late now.I need ()(go)home at once It ___very late.Let's walk quickly. It's too late.Let's it half past eight.