Negative adverbs with infinitives (ne pas, ne plus)

Negating infinitives with "ne pas"

When negating a conjugated verb, ne and pas sandwich it. But when negating an infinitive (an unconjugated verb), the two negative words stay together directly in front of it.

It is better not to touch the terrarium because of the venom.
Il vaut mieux ne pas toucher le terrarium à cause du venin.
It is important not to open the cage.
Il est important de ne pas ouvrir la cage.

Other negative adverbs: "ne jamais" and "ne plus"

The same rule applies to negative expressions like ne jamais (never) and ne plus (not anymore). They also stay together right before the infinitive.

I advise you to never touch the snake.
Je te conseille de ne jamais toucher le serpent.
He promises not to feed the lizard anymore.
Il promet de ne plus nourrir le lézard.

Following prepositions

When giving instructions, the negative pair often sits between a preposition (like de, à, or pour) and the infinitive verb.

You must be careful not to frighten the frog.
Tu dois faire attention à ne pas effrayer la grenouille.
I ask him not to clean the terrarium, so as not to break the glass.
Je lui demande de ne pas nettoyer le terrarium, pour ne pas casser la vitre.