Signal words for the Past Perfect Simple

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What are signal words for the Past Perfect Simple?

There are no  signal words solely for the Past Perfect Simple, but we often use the Past Perfect Simple together with Past Simple. Watch out when two actions in the past are combined.

The following words/phrases can indicate that Past Perfect Simple could be used:

  • already
  • before
  • for
  • just
  • never
  • not yet
  • once
  • until that day
  • when