"Might be" is just a special case of using the word "might." For the present tense, when deciding which to use, think about how you would right the sentence without "might" (for example, if you were sure the thing was true). Then add "might" and use the verb in it's normal form. For example: I wake up early every morning --> I might wake up early every morning. I am tall --> I might be tall. He is happy with the gift --> He might be happy with the gift. For the future tense, if you are using simple future (will run, will go, will be, ...) then just change "will" to "might". I will go that restaurant --> I might go to that restaurant. I will be smarter in the future --> I might be smarter in the future. I will be reading at that time --> I might be reading at that time.