How do you sign “Must” in ASL?
MUST: MUST in American Sign Language (ASL) marks obligation, the things that are not optional. Watch the video and animation below to see it signed.


When do you use the sign MUST?
MUST turns suggestions into requirements: must finish, must go, must study. It carries rules, deadlines, and doctor’s orders. Alongside NEED it maps the scale of necessity that daily plans keep running into. Household rules run on it, as any signing parent of a teenager can confirm.
It appears in Lesson 44 of Book 2.
📖 MUST is taught in Lesson 44 of ASLI 2: Building Conversations — Book 2 of the 216-Day Challenge →

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