What is the verb form of am?

One of the most confusing verbs for non-English speakers is the verb "to be." It is an irregular verb, and "am" is the first person singular, present tense. The present of "to be" goes like this: I am, you are, he/she/it is; we are, you (plural) are, they are. In the past tense, the forms are: I was, you were, he/she/it was; we were, you (plural) were, they were. And the future is "will be"-- it does not change at all: I will be, you will be, he/she/it will be, etc.