Multiple choice What does Professor Umbridge have Harry write in his detentions with her? I must not tell lies I will raise my hand I am a member of Dumbledore's Army I like Cho Chang Reveal answer Fill a bubble to check yourself A Correct answer Explanation During his detentions with Professor Umbridge, Harry is forced to use a Blood Quill to write 'I must not tell lies' until it is etched into his skin.