Le obligaron a firmar el documento.

English Translation

He was forced to sign the document.

Shouldn’t this be obligó?

No. The English sentence is passive, but the Spanish isn’t.

  • He ← was forced (by whom?) to sign the document
  • Le ← obligaron (quiénes?) a firmar el documento

The plural verb is typical when the subject is an indefinite ‘someone’.

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Other possibilities are “se le obligó” or “fue obligado”.

Google Ngrams shows the following statistics:

se le obligó 0.0000081997%
le obligaron 0.0000273102%
fue obligado 0.0000507582%

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