Participles are words that are formed from verbs but act as adjectives. They are called <em>verbals</em>. What is more, phrases are a group of words without a subject and a verb that function as as single part of speech. Therefore, participles consist of the participle and its complements and modifiers.
Taking all this into account, it can be said that the participial phrase is "trimmed that morning" and that it modifies the noun "grass". This is a past participle which is further specified by the NP "that morning" which gives information about the time in which the grass was trimmed.
I believe it would take 17 mins ( running) to burn off that cheeseburger <span />
In the spring of 1846, a group of nearly 90 emigrants left Springfield, Illinois, and headed west. Led by brothers Jacob and George Donner, the group attempted to take a new and supposedly shorter route to California