Heping verb or auxiliary verb such as will, shall, may, might, can, could, must, ought to, should, would, used to, need are used in conjuctions with main verb to help in making sentences.
these words not have meaning of itself.
I will have been studying chemistry for ten years.
here will have been auxiliary verb
and studying main verb.
He should be here by now.
I could swim quite well when I was younger.
You might have discussed it with me first.