"No" and "Not"

6.7 When οὔ has an acute accent, it usually means, No! When οὐ bears NO ACCENT, however, it is used to negate an INDICATIVE verb.

• οὐ δείκνυμι αὐτό.
  • I am not showing it (αὐτό).

Before a word starting with a vowel with smooth breathing, –κ is added to end of οὐ to make pronunciation easier.

• οὐκ ἀφίημι αὐτό.
  • I am not sending it forth.

Before a word starting with a rough breathing, the –κ is aspirated, becoming –χ:

• οὐχ ἵημι αὐτό.
  • I am not throwing it.

Verbs in the INFINITIVE MOOD use a different word to express “not”: μή. Note the following examples:  

• δίδωμι ὑμᾶς παρεῖναι.
  • I give (= allow) you all (ὑμᾶς) to be present.
• οὐ δίδωμι ὑμᾶς παρεῖναι.
  • I do not allow you all to be present.
• δίδωμι ὑμᾶς μὴ παρεῖναι.
  • I allow you all not to be present.