We laughed at the colorful ball. Is this sentence structurally ambiguous?

yes

No, the sentence "We laughed at the colorful ball" is not structurally ambiguous. It can only be interpreted in one way, where "we" is the subject, "laughed" is the verb, and "at the colorful ball" is the prepositional phrase providing additional information about where the laughter was directed.

To determine if a sentence is structurally ambiguous, we need to examine if it can be interpreted in multiple ways based on its grammar structure. Let's break down the sentence:

"We laughed at the colorful ball."

This sentence can be understood in two different ways:

1. The ball is colorful, and we laughed at it.
2. We laughed while the ball was colorful.

Therefore, this sentence is structurally ambiguous as it allows for multiple interpretations based on its grammar structure.