The answer is an adverb clause because "have been" is considered an adverb clause...
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.
Couplet = couple = 2 lines
Quatrain = quadruple = 4 lines
Sestet = 6 lines
Octave = octagon = 8 lines
Thats how I try to remember it.
The correct answer would be the third option. Based on the given excerpt above from Hemingway’s A Farewell to Arms, the excerpt exemplifies how Hemingway's dialogues typically includes <span>colorful language and specific word choices to define complex ideas. Hope this is the answer that you are looking for.</span>
