ず is the classical version of the negative ending ない. It is often used in writing and in other grammatical structures. For group 1 and 2 verbs we simply replace ない with ず as per the following table:
|to go home|
For group 3 verbs.
To create the ないで te form we simply add に.
|Without much considering the other person’s feelings he hurled some harsh words.|
|To book a holiday without hesitation.|
|To go to a restaurant without making a reservation.|