When we learn English verbs, we usually spend a lot of time remembering when to use a certain tense A, and then when to use another tense B. However, few of us pay attention to when we should not use a tense A or a tense B. When we see “I’m loving you,” or “I have preferred this job” (note that it is different from “I would have preferred this job“), we say we should probably use the present simple in the first sentence, and the past simple in the second, instead of the present continuous and the past perfect respectively. But why not?