Hello , I think : Verb to think in the present tense , indicating that the action of the verb ( here think) is taking place in the present . It could indicate a habit or a fact as well . I think it is a good idea to call her first .That represents my opinion in the present . I think English is difficult to learn . That is my opinion in general as a fact. I always think a lot before taking a decision . It is a habit here . I am thinking : It is the present continuous tense ,that is formed by verb to be + verb in infinitive+ ing : am + think + ing It refers to actions taking place at the very moment , now . Wait , i am thinking about it right now! I am doing that action of thinking right now at this moment . Hope you got the difference clear :)