am, are, is, do, does, have, has, can

was, were, did, had, could, might, will, would, should, may

will be, have been, has been, had been, should be, will have, might have, should have been, should not be, must have been

aren’t, isn’t, don’t, doesn’t, haven’t, hasn’t, can’t, wasn’t, weren’t, didn’t, hadn’t, couldn’t, won’t, wouldn’t, shouldn’t