
Originally Posted by
Tdol
I get your point, but people do talk about the partial rule of law, so it can be modified. Some learners take patterns of usage and even when the grammar book says things like 'we prefer', they interpret it a rule that is to be applied in every circumstance. There are descriptions and even rules about progressive forms of stative verbs, but there are exceptions.
I don't like I am owing much and will leave it for those who want to use it. Some books give it as a rule, others as a tendency, so saying its not an absolute rule seems OK to me. The other option would be to say that a single exception means there's no rule or that books are wrong, which may undermine learners' trust.