Os

Determiner

  gardas

Noun

  están

Auxiliary

  nas

  portas

Noun

,  non

🙅

Particle

  para

Adposition

  impedir

Verb

  entrar

Verb

,  senón

Coordinating conjunction

  para

Adposition

  impedir

Verb

  saír

Verb

.

The guards are at the gates, not to prevent them from entering, but to prevent them from leaving.

The

guards

are

at the

gates ,

not

to

prevent them from

entering ,

but

to

prevent them from

leaving .