What does the verb "think" mean in the sentences, an action or a state?

1. I think he is very smart. \( **\.\.\.** \). 2. I am thinking about it now. \( **\.\.\.** \) 3. I will think about it. \( **\.\.\.** \). 4. I think you are wrong. \( **\.\.\.** \). 5. What are you thinking of? \( **\.\.\.** \)