Ribbing is back! For this particular rib pattern, you will be doing things a little differently than k2, p2 or what have you.
Work this rib on an uneven number of stitches
Row 1: Knit all stitches
Row 2: Purl 1, Knit the stitch below the next stitch on the left needle, dropping both it and the unworked stitch off the left needle at the same time. Repeat to end of row, ending with P1.
Repeat these two rows for pattern.
Confused? As always, here is a video to help you out. Enjoy!