To sign SKATE as in I-C-E "SKATE" form your hands into "X" handshapes. Then put them in front of you, palms facing up. Alternate moving them forward and back a couple times.
Memory tip: Think of the movement of a skater's feet. Think of the upturned "X" as representing the curved blade on the skates.
ICE-SKATE:
Here's a close-up of that handshape:
See: ROLLERBLADE
See: "SKATING"
Notes: