• A. We use continuous forms for actions and happenings that have started but not finished (they are eating I it is raining etc.). Some verbs (for example, know and Like) are not normally used in this way. We don't say 'I am knowing' or 'they are liking'; we say 'I know', 'they Like'.
• Think
• See hear smell taste
• Look feel
• He is selfish and He is being selfish