[In the past tense Ross does very nice on his affix checking. He seems to regularly accepts words that end in a "t" particularly, and a "d" somewhat less, as already being past tense, and doesn't continue to mark them. That extends even to something like "fight" which you you think he might know the past tense of, like "fought" but he doesn't, but he really likes "they fight" as if it were the past tense, and that's the past tense he gives. There are a few past tenses that he doesn't want to say at all, like "ate"]