Learn Spanish (Latin America): Quiero dejar un recado, pero no tengo con qué escribirlo. - I want to leave a message, but I have nothing to write it with.

This is a special structure used to say you lack the means or tools to do something. It combines no tener (to not have) with a preposition (here, con), an interrogative word (qué), and an infinitive (escribir). Literally, it reads as "I do not have with what to write it," which gives us the natural English translation "I have nothing to write it with."

Why does qué have an accent mark here if it is not a direct question?

In these negative existential structures, qué acts as an indirect question word meaning "what." Even though there are no question marks in the sentence, it keeps its accent to distinguish it from the relative pronoun que (meaning "that" or "which").

What is the difference between leaving a recado and a mensaje?

Both translate to "message," but recado is very commonly used in Latin America specifically for a message left for someone who is unavailable, such as a handwritten note or a message left with a receptionist. Mensaje is a broader term that applies to any message, including SMS text messages (mensajes de texto).

Could I move the pronoun lo before the conjugated verb and say no lo tengo con qué escribir?