Question

请教各位前辈一个英语问题

小生请教各位，I don't know what to do.'这句话后面的what to do做know 的宾语。是宾语从句、记得小时老师说过，这里的what to do是个缩写，小弟请教各位。如果要写完整该如何写

Answer 1

这是what引导的名词性从句，与一般的宾语从句（如：I said that I was not there）不同的是，what要在后面的从句中充当成分，此句中，what充当的是从句what I should do 中do的宾语，完整的表达是I don't know what I shoulld do。换成定语从句的表达是，I don't know the thing that I shoulld do。
这种句子很典型，类似的还有where ，when ，how，why，下面举例：
I don't know where to read.（I don't know where I should read)我不知道去哪阅读
I don't know when to read。.（I don't know when I should read）我不知道什么时候阅读
同理。找几个句子练一下吧，不懂可以追问。

Answer 2

I don't know what to do (with Myself).
只不过是强调了一下don't know what to do 的无奈的语气

Oh,I like having a job. I wouldn't know what to do with myself if I was at home all day.
啊，我想找个活儿干。要是成天呆在家里。那我就不知道怎么打发日子了。
I swear I don't know what to do with myself.我真不知道怎么样才好呢。

PS:楼下的加上虚拟语气也是对的

Answer 3

可以是 what i have to do ?
这个是完全没有必要让你去拆开来写他的完整句子的。根本就不会考，就是一个习惯的用法，侧重点不应该放在这个上面的；

Answer 4

I don't know what I should do.

Answer 5

I don't know what I need to do .

Answer 6

I don't know what to do