Ya que llegamos temprano, haremos una reserva para mañana.

Since we arrived early, we will make a reservation for tomorrow.

Breakdown of Ya que llegamos temprano, haremos una reserva para mañana.

• una: a
• hacer: to make
• para: for
• nosotros: we

Questions & Answers about Ya que llegamos temprano, haremos una reserva para mañana.

What does ya que mean here?

It’s a causal connector meaning since / because / given that. It does not mean “since” in the temporal sense. Don’t read ya as “already” here; ya que together introduces a reason or justification.

Can I replace ya que with porque, como, puesto que, or dado que? Any nuance differences?

Yes, and each has a slight feel:

• porque = because (most general; often used mid‑sentence: Haremos una reserva para mañana porque llegamos temprano.)
• como = since/as (very natural at the beginning: Como llegamos temprano, haremos…; less usual mid‑sentence)
• ya que = since/given that (often used to justify a decision, neutral‑formal)
• puesto que / dado que = since/given that (a bit more formal/literary)

All are correct here. Starting a sentence with como or ya que is especially common in Spanish to foreground the reason.

Is llegamos present or past (preterite) here?