The French verbs dormir, endormir, and rendormir all relate to sleep but have distinct meanings and uses. They can be used in their transitive, intransitive, or pronominal forms.

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1. Dormir (to sleep)

• Meaning: To sleep.
• Form: Intransitive (does not take a direct object).
• Etymology: From Latin dormire, meaning “to sleep.”

Conjugation:

• Present:
  Je dors, tu dors, il dort, nous dormons, vous dormez, ils dorment.
• Passé Composé:
  J’ai dormi, tu as dormi, il a dormi, nous avons dormi, vous avez dormi, ils ont dormi.

Examples:

• Je dors huit heures par nuit.
  (I sleep eight hours a night.)
• Hier, j’ai dormi jusqu’à midi.
  (Yesterday, I slept until noon.)

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2. Endormir (to put to sleep, to fall asleep)

• Meaning:
• Transitive: To put someone or something to sleep.
• Pronominal (s’endormir): To fall asleep.
• Etymology: From Latin in- (into) + dormire (to sleep).

Conjugation:

• Present:
  J’endors, tu endors, il endort, nous endormons, vous endormez, ils endorment.
• Passé Composé:
  J’ai endormi, tu as endormi, il a endormi, nous avons endormi, vous avez endormi, ils ont endormi.

Examples:

• Transitive:
  La musique endort le bébé.
  (The music puts the baby to sleep.)
• Pronominal:
  Je m’endors toujours devant la télé.
  (I always fall asleep in front of the TV.)
• Hier, je me suis endormi à 22 heures.
  (Yesterday, I fell asleep at 10 p.m.)

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3. Rendormir (to put back to sleep, to fall back asleep)

• Meaning:
• Transitive: To put someone or something back to sleep.
• Pronominal (se rendormir): To fall back asleep.
• Etymology: From Latin re- (again) + dormire (to sleep).

Conjugation:

• Present:
  Je rendors, tu rendors, il rendort, nous rendormons, vous rendormez, ils rendorment.
• Passé Composé:
  J’ai rendormi, tu as rendormi, il a rendormi, nous avons rendormi, vous avez rendormi, ils ont rendormi.

Examples:

• Transitive:
  Elle a rendormi son enfant après le cauchemar.
  (She put her child back to sleep after the nightmare.)
• Pronominal:
  Je me suis rendormi après le bruit.
  (I fell back asleep after the noise.)

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Key Differences:

• Dormir: Simply means “to sleep.”
• Endormir: Focuses on the act of falling asleep or making someone sleep.
• Rendormir: Focuses on returning to sleep or making someone sleep again.