sia successa

happened

→ essere
phrase Rare #32,346
happened Used with feminine singular subjects; often appears in the present perfect subjunctive, as in questions like 'how do you think it happened?'
IT: Non so cosa sia successa.
EN: I don't know what happened.

Come pensate che sia successa?

How do you think it happened?

Non credo che sia successa.

I don’t think it happened.

Qualsiasi cosa sia successa non decidi tu, pezzo di merda!

Whatever happened isn't your decision, you piece of shit!

— Carandiru (2003)

Non penso che sia successa.

I don't think it happened.

Come pensi che sia successa?

How do you think it happened?

Perché pensate che sia successa?

Why do you think this happened?

Come pensa che sia successa?

How do you think it happened?