This week, the difference between 'continuously' and 'continually'.
'Continually' means occuring again and again, as in: "He irritated her continually day after day. She considered a divorce. Was it worth the time and effort to cultivate a relationship that seemed to be doomed to failure? She couldn't decide."
'Continuously' means occuring without a break, as in: "He irritated her continuously, minute by minute. She considered murdering him in his sleep. No jury in the world would convict her. Her defence would be to plead temporary insanity. Her lawyer would try to get a panel of women selected for the trial."