use of "be"

"Be" basically means "to be". For example, to be cold, or to be hungry. It is expressed differently depending on who you are talking about, and what tense you are using. In present tense we use "is", "am", and "are". In past tense, we use say "was" and in future we say "will be". So for example, in future tense: "If you do not wear a coat, you will be very cold." In past tense: "She used to be very sad." In present, we don't use "be" in it's original form. So saying "I BE cold" is WRONG. You have to say "i AM cold" in order for it to be correct. Let me know if this was too confusing :)