To sign 'couldn't', form both hands into 'S' handshapes (closed fists) with your palms facing down. Hold them in front of your chest and move both hands firmly downward a short distance. It is crucial to shake your head side to side and furrow your eyebrows while making this motion to convey the negative meaning.
Establish the past context if needed, point to yourself for 'I', sign 'couldn't' with a clear headshake, and then sign 'go' and 'party'.
Point to the person for 'she', sign 'couldn't' while shaking your head, and follow with the signs for 'find' and 'keys'.
Sign 'we', use the 'couldn't' sign with a negative head movement, and then sign 'understand' and 'movie'.
Establish the past context if needed, point to yourself for 'I', sign 'couldn't' with a clear headshake, and then sign 'go' and 'party'.
Point to the person for 'she', sign 'couldn't' while shaking your head, and follow with the signs for 'find' and 'keys'.
Sign 'we', use the 'couldn't' sign with a negative head movement, and then sign 'understand' and 'movie'.
In ASL, tense is usually established at the beginning of a sentence or understood from context. 'Couldn't' is often signed the same way as 'can't' (or 'can' with a headshake), with the past tense context provided by signs like 'YESTERDAY' or 'PAST'.
In ASL, negation is frequently shown by signing the positive action while simultaneously shaking your head. By signing 'can' with a negative headshake, you are grammatically expressing 'not able to'.
While some signers may mouth the English word, the most critical components are the negative headshake and furrowed eyebrows. These non-manual markers are what officially negate the sign in ASL.
