noun
a word that represents a person, place, thing, or idea
adjective
a word that describes or modifies a noun or pronoun
preposition
a word that shows the relationship between a noun or pronoun and other words in a sentence
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She often found herself lost in thought during long meetings, contemplating the best course of action.
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While staring out the window, he was completely lost in thought about his upcoming vacation.
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I was so lost in thought about the party last night that I completely forgot about my homework.
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As the music played, she was lost in thought, dancing in her own world.