Often beginning knitters may find that after a few rows of knitting, there are a few gaping holes in their fabric (Slide 1). This is caused by accidentally wrapping your yarn around your needle (called a yarn-over, slide 2). This technique can be used on purpose to make lace. A: To avoid yarn-overs, be careful when switching between knit and purl stitches. Knit stitches have the working yarn held behind the needle, while purl stitches have the working yarn held in front of the needle. When switching stitches, move the yarn from front to back or back to front underneath the needle, rather than over it (Slide 3).