The pattern I'm working on now has 45 stitches across and you single crochet one, double crochet in the next, single crochet in the next, etc. But it says "until you get to the last stitch. Then turning chain 3 and single crochet in the last stitch." I don't understand this. Can anyone help me?

what that refers to is the last stitch of the row before. you turn and chain 3 and then single crochet in the last stitch of the previous row. hope this helps. Ellen