Present Tense:
* am (I am)
* are (you are, we are, they are)
* is (he is, she is, it is)
Past Tense:
* was (I was, he was, she was, it was)
* were (you were, we were, they were)
Future Tense:
* will be (I will be, you will be, he will be, she will be, it will be, we will be, they will be)
Other Forms:
* being (present participle)
* been (past participle)
Note: "Be" can also be used as a modal auxiliary verb in conjunction with another verb, such as "be going to" or "be able to".
Let me know if you'd like more examples or have any other questions!