What is a Helping Verb?

'Helping verbs' work with the main verb to give the reader a better idea of when the action takes place. In this example, the action will take place in the future:
 

talk will talk
love will love
open will open
walk will walk
watch will watch

The 'helping verb' is "will". Here are some common helping verbs:
 
 

am are is was were
has have had shall will