No estoy seguro, pero a lo mejor extraviaste el llavero ayer.

Questions & Answers about No estoy seguro, pero a lo mejor extraviaste el llavero ayer.

Since this sentence expresses doubt, why is extraviaste in the indicative instead of the subjunctive?
You are right that doubt usually triggers the subjunctive in Spanish. However, the phrase a lo mejor (maybe/perhaps) is a special exception. It always takes the indicative mood, even though it expresses uncertainty. So we use the normal past tense extraviaste instead of a subjunctive form.
Why use extraviaste instead of perdiste here?
Extraviar and perder both mean to lose, but extraviar specifically means to misplace something—losing it temporarily because you forgot where you put it. Perder is more general and can also mean losing something permanently, losing a game, or missing a flight.
How is the word llavero formed?
Llavero comes from llave (key) plus the suffix -ero, which is often used to indicate an object where things are kept. A llavero is a keychain or keyring—the item that holds your keys!
Why is it extraviaste and not extraviabas?
We use the preterite extraviaste rather than the imperfect extraviabas because misplacing the keychain was a single, completed event that happened at a specific time (ayer - yesterday), rather than an ongoing or repeated action in the past.

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