Let’s see how much you know about commas?  If you put the right number of commas in the right places in this Clamdigging sentence (and you know why you did it!), then you are a Professional Clamdigger.  If not, you may be one in the making; check out this website and check out my Loving Grammar book.

Ready?  Here’s the test sentence:

Trapped on a sandbar by the incoming tide the amateur clamdiggers Pete and Don who could not swim had to be rescued.