I know that 'as much/many as' act like adverb to show how much thing is compare to another.
In my English book (English grammar in use by Raymond Murphy, Cambridge) there are some exercises to write a new sentence with the same meaning.
I'm not sure how to put 'as much as' in my sentence when thing we explain is a noun phase.
The first one
There are fewer students in this class than in the other one
The book's answer is " There aren't 'as many students in this clas as' in the other room"
The second one
You known a bit about cars, but I know more
The book's answer is "You don't known 'as much about cars as' I do"
I feel confused when I have to seperate as much ... as Therefore I wonder could I put them as a group and speak like these
You don't know about cars 'as much as' I do.
There aren't students 'as many as' the other one.
Are they grammatically correct and sound naturally?