We are glad to inform. We are proud to inform. "We" is the subject, a group of people. "are" is a helping verb, which comes before a descriptive adjective or adverb. For instance... "is" purple, "was" gone, "will be" here. These are your helping verbs: am, is, are, was, were, be, being, been, can, could, shall, should, will, would, have, has, had, do, does, did, may, might, must. They describe what is happening. The state of being... "We ARE happy". "We happy" is broken English and does not connect the two words. In this sentence there is a group of people and there is happy, but no connection to the people and "happy". "Who" is happy? "We" ARE happy. "Are" in this sentence, means that it is happening now. We are currently happy. "Were" means it happened in the past. We were happy. And likewise.... "Will be"... We will be happy.... in the future. We must be happy... (It is necessary that we be happy).. We should be happy (We ought to be happy), etc.