Could you have forgotten your sunglasses in the car What is sentences complete verb phrase?

The complete verb phrase in the sentence "Could you have forgotten your sunglasses in the car?" is "could have forgotten".

Here's why:

* "Could" is a modal auxiliary verb, indicating possibility.

* "Have forgotten" is the past participle of the verb "forget," forming the perfect tense.

Together, they make up the verb phrase expressing the action of potentially forgetting something in the past.