1
I feel much better today.
Sign 'I', then 'feel', and finish with 'better' by starting the open 'B' handshape at your mouth and pulling it to the side into an 'A' handshape. Add a positive, relieved facial expression to show your improvement.
2
This book is better than that one.
Set up the two books in your signing space by pointing to different sides. Point to the first, sign 'better' using the sweeping motion across your mouth into the 'A' handshape, and then point to the second.
3
Are you getting better at signing?
Sign 'you', 'sign', and 'better'. When signing 'better', ensure your hand smoothly transitions from the open 'B' to the 'A' handshape as it moves. Remember to raise your eyebrows at the end to indicate a yes/no question.