Different helping verbs are used for different purposes in sentences. One of their main functions is to situate the action of a sentence in a particular aspect of time. The two main aspects that helping verbs play a role in are the progressive aspect and the perfect aspect.
Baastrup syndrome is characterized as the of abnormal contact or rubbing between adjacent spinous processes. 0 Baastrup Syndrome patients report severe fatigue (0%). 2  1 Baastrup Syndrome patients report moderate fatigue (100%). 3  0 Baastrup Syndrome patients report mild fatigue (0%). 4  0 Baastrup Syndrome patients report no fatigue (0%).
Waardenburg syndrome is a genetic disorder characterized by patchy areas of depigmentation (albinism) of the skin and hair. One type of Waardenburg syndrome also produces congenital deafness (deaf at birth). This disorder is believed to account for 2-3% of all cases of congenital deafness.