Si el precinto estuviera roto, llamaría al fabricante.

to be

Breakdown of Si el precinto estuviera roto, llamaría al fabricante.

• al: to the
• si: if
• llamar: to call

Questions & Answers about Si el precinto estuviera roto, llamaría al fabricante.

What grammar pattern is this sentence using?

It is the classic Spanish pattern for a hypothetical or unlikely condition:

si + imperfect subjunctive + conditional

So here:

• Si el precinto estuviera roto = the imagined condition
• llamaría al fabricante = the result

This is very similar to the English If ..., I would ... pattern.

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Why is estuviera used after si?

Because Spanish normally uses the imperfect subjunctive after si when the condition is hypothetical, unlikely, or contrary to reality.

So:

• Si el precinto estuviera roto... = If the seal were broken...

You do not use the conditional after si in this kind of sentence.

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Why is llamaría in the conditional?

Because it expresses the consequence of that hypothetical situation.

In this structure:

• the if-clause uses the imperfect subjunctive
• the result clause uses the conditional

So:

• Si el precinto estuviera roto, llamaría...
• If the seal were broken, I would call...

The conditional here means would call, not a real action that is actually happening.

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Can I also say estuviese instead of estuviera?