I don't know how I can use the new machine(同义句)

问题描述:

I don't know how I can use the new machine(同义句)
she has hardly had anything the whole day,--- ---?

I don't know how I can use the new machine
I don't know how to use the new machine
she has hardly had anything the whole day,has she?(注意前面有hardly)
多谢!