Hi, Wendell ! Your situation can make a useful argument in favor of teaching grammar. As you know, the two errors are grammar-based, springing from the writer's inability to spot when a sentence ends. I suggest more practice in recognizing the endings of sentences. You might also place periods at intervals on a sheet of paper and ask the student to insert a complete idea before each period. Beyond this exercise, you might want to point out where comma splices seem to occur most frequently. In my experience, this error occurs before pronouns such as "it," "they," "his," etc., and conjunctive adverbs and transitional phrases such as "therefore," "however," "as a result," etc. I usually tell a student that when these words appear in the middle of sentences, he/she should think of using semicolons or periods before them, not commas. Good luck! Rudolph Brathwaite Montgomery College Rockville Campus