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Difference between Be good form and Be in good form

be good formbehave according to custom or etiquette:

  • It is not considered good form to arrive too early at a dinner party.

be in good form

1. (Sport) be in good condition of health and training:

  • If a horse is in good form it is likely to win a race.

2. be in good spirits:

  • On Sunday she was in good form and was doing housework. She wasn’t in a huff or anything…