Ustedes dejan de mentir y empiezan a quejarse.

Questions & Answers about Ustedes dejan de mentir y empiezan a quejarse.

Why is there a de in dejan de mentir?
The phrase dejar de followed by an infinitive (like mentir) is a set expression that means "to stop doing something." Without the de, the verb dejar on its own usually means "to leave" or "to let/allow."
The English translation says "lying." Why doesn't the Spanish use the "-ing" form (mintiendo)?
In Spanish, whenever a verb directly follows a preposition (like de or a), it must be in its infinitive form (ending in -ar, -er, or -ir). English says "stop lying," but Spanish uses the infinitive: dejar de mentir (literally "stop of to lie").
Why does empiezan use a instead of de?
Many Spanish verbs require a specific preposition before another action, and these just have to be memorized. While dejar uses de to mean "stop doing," empezar (to start) always uses a before an infinitive.
Why does quejarse end in se if the subject is ustedes?
The reflexive pronoun se covers both the third-person singular (él, ella, usted) and plural (ellos, ellas, ustedes). Since ustedes is the subject, the se in quejarse perfectly matches it. You could also place the pronoun before the conjugated verb: se empiezan a quejar.

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