An auxiliary verb, also referred to as a helping verb, is one that is the part of a verb phrase that helps the main verb. As part of a verb phrase, a helping verb might show when an action occurs or whether the action is required. Let's look at a few examples to get a sense of just what auxiliary, or helping verbs, do.
The one reason that the Battle of Barbarossa became a turning point in the war was the number of casualties that the German army suffered. The Russians also suffered a huge number of casualties, but still they were able to hold their ground. The German army failed to push forward and ultimately they had to resort to attacking the United states.
Many authors have argued that the struggle for Guadalcanal, from August 1942 to February 1943, marked the turning point in the Pacific theater.(19) There are certainly sound reasons for making this argument. During the campaign the Japanese, for the first time, lost territory.