Helping verbs pitch in when other verbs need their services, as in the following examples (the helping verbs are bold italic, while the main verb is italic):
The building will be demolished later this year.
Everyone could have finished dinner if we had arrived 30 minutes earlier.
Crew members have delighted cruise ship passengers for years with their zany antics.
Just so you know, separating the helping verb from the main verb is okay and more effective at times, as long as the separation doesn’t risk confusing the reader. Here are a few examples:
I have always preferred cupcakes over muffins.
I am not going to put up with this much longer.
Did you wonder where I’d been?
Helping Verbs