Ne quis sub porticu clamet, dum magistra de auctore et scriptore narrat.

Let no one shout under the portico while the teacher tells about the author and the writer.

Breakdown of Ne quis sub porticu clamet, dum magistra de auctore et scriptore narrat.

• et: and
• magistra: the female teacher
• narrare: to tell
• de: about

Questions & Answers about Ne quis sub porticu clamet, dum magistra de auctore et scriptore narrat.

Why does the sentence begin with ne?

Here ne introduces a negative command or negative jussive.

So Ne quis sub porticu clamet means something like:

• Let no one shout under the colonnade
• No one should shout under the colonnade

This is a very common Latin pattern:

• ne
  • subjunctive = do not / let no one / may ... not

It is not the ordinary simple negation non.
Non would just deny a statement; ne is used for prohibition or negative purpose/jussive uses.

Why is clamet subjunctive instead of clamat?

Because after ne in this kind of sentence, Latin uses the subjunctive.

Clamet is:

• present subjunctive
• 3rd person singular
• from clamare = to shout

So:

• clamat = he/she shouts or is shouting
• clamet = let him/her shout, may he/she shout, or in this sentence with ne: let no one shout

This is not describing what someone is doing; it is expressing what should not happen.