Well, I can't get angry, okay? I mean, I have a tendency to internalize. I can't express anger. That's one of the problems I have—I grow a tumor instead.

Such taxes may result from stereotyping, conditioning, or imposed social roles. Merchants' discrimination on the basis of skin colour is a stereotype tax on Black Nova Scotians.

They were, he said, agogwe, the little furry men whom one does not see […]

On the semantic level we understand as obligatory those modifications about which the speaker has an important information so that he must be able to answer a wh-question formed by the listener in the case that there is an ellipsis of the given member of the sentence on the syntactic level. The necessity to be able to answer a wh-question is thus a criterion distinguishing obligatory and optional modifications.