Encontramos la bala en la caja.

Encontramos is the first-person plural form of encontrar: we find / we found.

In this sentence, it is understood as we found.

A useful thing to know is that encontramos can be ambiguous out of context, because for nosotros some verbs have the same form in the present and the preterite:

• encontramos = we find
• encontramos = we found

Usually, context makes the meaning clear.

Because Spanish often omits subject pronouns when they are not needed.

The ending -amos already tells you the subject is we. So Encontramos already contains the idea of we.

You could say Nosotros encontramos la bala en la caja, but that would usually add emphasis or contrast, for example:

• Nosotros encontramos la bala, no ellos.
  We found the bullet, not them.

Because bala and caja are both feminine singular nouns, so they take the feminine singular definite article la.

• la bala
• la caja

In Spanish, articles must agree with the noun in gender and number.

La means the speaker is referring to a specific bullet and a specific box, or to ones that are already understood from the context.

Compare:

• Encontramos la bala en la caja.
  = We found the bullet in the box.

• Encontramos una bala en una caja.
  = We found a bullet in a box.

So the article choice depends on how specific the speaker wants to be.

Here, en means in.

So en la caja = in the box.

More generally, Spanish en can cover several English prepositions depending on context, such as:

• in
• on
• at

But with caja, the natural meaning is in the box.

Because the personal a is normally used with people and sometimes with specific animals or personified beings, not with ordinary things.

Since la bala is an inanimate object, you do not use a:

• Encontramos la bala... ✔
• Encontramos a la bala... ✘

You would use the personal a in a sentence like:

• Encontramos a María.
  We found María.

Yes. It is a very normal, neutral word order:

• Encontramos = verb
• la bala = direct object
• en la caja = location phrase

So the pattern is basically:

Verb + object + location

Spanish word order is more flexible than English, so other versions are possible for emphasis, but this one is the most straightforward.

Yes, in isolation it could.

As mentioned earlier, encontramos can be either:

• we find (present)
• we found (preterite)

So without context, the form itself does not tell you which one it is. Context, time words, or the wider conversation normally make it clear.

For example:

• Cada vez encontramos la bala en la caja.
  = present-type meaning

• Ayer encontramos la bala en la caja.
  = clearly past

A simple pronunciation guide is:

en-con-TRA-mos la BA-la en la KA-ha

A few points:

• encontramos is stressed on -tra-
• bala is stressed on ba-
• caja is stressed on ca-
• the j in caja is pronounced with the strong Spanish j sound, like the ch in Scottish loch or German Bach

So caja does not sound like English kaja or kadja. The middle sound is much rougher.

In practice, it suggests both ideas at once: the bullet was in the box, and that is where we found it.

So the natural interpretation is:

• the bullet was located in the box
• our finding happened with the bullet there

In a short sentence like this, Spanish does not usually separate those two ideas. The phrase en la caja naturally gives the location connected to the finding.