The participle or participial phrase in each sentence is "worried about" and "made a nervous joke ".
<h3>What is participial phrase?</h3>
A combination of words called a participle phrase usually includes a participle, a modifier, and a pronoun or a noun phrase. When an action is taken in a phrase, the pronoun or noun will be the recipient. If a participial phrase appears at the start of a sentence and the next phrase is a complete sentence, a comma is required after the participial phrase.
There will be a present or past participle at the start of a participle sentence. Whenever the participle is present, the sentence always ends in ing. The final letter of a regular past participle is always ed. The terrible thing is that irregular past participles can end in many different ways.
The term "present participle phrase" refers to a group of words that begin with the present participle and modify a noun in a sentence.
To learn more about participial phrase from the given link:
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The wonders of nature are really fascinating
A. Warm air rises and F. Cooler air travels back to the ocean surface
B. because the conflict is that he is conflicted of wether or not to ask whitney to marry him so its a internal conflict.
B. charecter vs. self
