Fill in the gaps in the rule.

Some verbs can express both states and actions, depending on the ... . Take the verb think for example. We can use think as an action verb or a verb of state. Let's take a look at how think can be used as an action verb. We can say, "he is thinking about lunch". In this case, we can use think with ... because it's expressing an ... .
However, If I say, "she thinks the teacher is boring", now I'm using think as a verb of ... .
Here think means believe, so we ... use it with ing.