No debes engañar durante la partida.

You must not deceive during the game.

Breakdown of No debes engañar durante la partida.

• durante: during
• no: no
• deber: must
• la partida: the card or board game (one play-through)

Questions & Answers about No debes engañar durante la partida.

Why is there no subject like tú in this sentence?

Because Spanish often omits subject pronouns when the verb already makes the subject clear.

Here, debes is the tú form of deber, so a native speaker understands that the subject is you without needing to say tú.

• (Tú) no debes engañar durante la partida.

Adding tú is possible, but it usually gives extra emphasis:

• Tú no debes engañar durante la partida.

That might sound like you specifically should not do it.

How does no debes + infinitive work?

This is a very common structure in Spanish:

• no = negation
• debes = you should / you must / you are supposed to
• engañar = infinitive verb

So the pattern is:

• No debes + infinitive

It means something like you should not... or you must not...

Examples:

• No debes correr.
• No debes mentir.
• No debes tocar eso.

The infinitive comes after debes because deber works like a modal verb, similar to should or must in English.