Learn Spanish (Spain): La silla está aquí ahora.

Aquí means "here", meaning the chair is right next to or very close to the person speaking. If the chair was far away from the speaker, you would use allí ("over there").

Why does this sentence use está instead of es?

Both can translate to "is", but Spanish uses está (from the verb estar) for physical locations. Since this sentence tells us where the chair is (aquí), we must use está.

Why is there an accent mark on está?

The accent mark changes the meaning! Está means "is". Without the accent mark, esta means "this" (as in esta silla = this chair). The accent lets us know we are using the verb.

Could I put ahora at the beginning of the sentence?

Yes! Spanish word order is quite flexible. Saying "Ahora la silla está aquí" is perfectly correct and is a great way to emphasize when the chair is here.