The correct answer would be helping verbs. The helping verbs are combined with the main verbs to indicate time, possibility and other kinds of meaning. The helping verbs' function is to help extend the meaning of the main verbs by adding more detail on it. Helping verbs are very essential in the formation of different tenses of the verb.
What does the idiom, "it's raining cats and dogs" mean?
We can collaborate on the project together.
These artifacts are from the Neolithic Era.
Teacher, may I please use the lavatory?
If the structure isn't built right, the ceiling could collapse!
What is the isotherm on the map?
The medicine will help alleviate the pain.
What story are you talking about?
