never

In a sentence

• Je ne vais jamais oublier ce jour.

  I will never forget this day.

  Here, 'jamais' is used with 'ne' as a negation to indicate that the action of forgetting will not occur at any time.

• Jamais je n'aurais pensé que cela arriverait.

  Never would I have thought that this would happen.

  In this sentence, 'jamais' is used for emphasis at the beginning, indicating a strong negation of the possibility.

• Cela n'arrive presque jamais.

  It almost never happens.

  Here, 'jamais' adds nuance by pairing with 'presque', meaning 'almost never', to downplay the frequency of occurrence.