Question: how to do a half double crochet?
Answer: 1Do 15 chain stitches (ch 15). ... 
2Chain 2 more stitches. ... 
3Yarn over the hook (yo) and insert your hook in the third chain from the hook. ... 
4Yarn over the hook and gently pull the wrapped hook through the center of the chain stitch, carrying the wrapped yarn through the stitch.