Bonjour,
Réponse :
1. HE HAS WRITTEN A LETTER à la forme negative et question,
(-) He hasn't written a letter.
(?) Has he written a letter?
2. THEY HAVE NOT STOPPED à la forme positive et question,
(+) They have stopped.
(?) Have they stopped?
3. HAVE WE DANCED? à la forme positive et negative,
(+) We have danced.
(-) We haven't danced.
4. SHE HAS WORKED à la forme negative et question
(-) She hasn't worked.
(?) Has she worked?
5. ANDY HAS NOT SLEPT à la forme positive et question.
(+) Andy has slept.
(?) Has Andy slept?
Explications :
(+) sujet + has/have + participe passé
(-) sujet + hasn't/haven't + participe passé
(?) Have/Has + sujet + participe passé ?