にすぎない - Grammar Discussion

no more than
just
merely

Structure

  • Verb(だけ) + にすぎない
  • Noun + にすぎない
  • いAdj・だけ + にすぎない
  • なAdj・な・だけ + にすぎない

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Would だけ or ばかり not be acceptable synonyms for this grammar point? If not, can someone explain the difference in usage? Thank you!