when use " to be" and " have verb"

助动词“做”、“做”,“有”一个auxiliary verb helps the main (full) verband is also called a "helping verb." With auxiliary verbs, you can write sentences in different tenses, moods, or voices. Auxiliary verbs are: be, do,have, will, shall, would, should, can, could, may, might, must, ought, etc.

when use ''to be ''and ''have verd