I have recently read in English grammar book like this:
You___________ your notebooks from tomorrow
1. need not bring
2. need not to bring
The answer is need not bring
But why not another?
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When the verb need is used as a modal verb (which is an extremely rare case in modern-day spoken English), the verb immediately following it should have no infinitive marker (to). That's something all modal verbs have in common. For instance:
I just could not do it.
You must not see it!
You should bring it to me right now!
Probably, the only time you will ever hear need used as a modal verb would be in mathematics textbooks and programming manuals written in overly formal language (at least that's where I hear it used most often):
The solution to a differential equation need not be unique.