Grammar question?

Using prepositional phrases what do I Crossout in the sentence " my most valuable lesson from this class was learning about my writing potential. ?

Using prepositional phrases what do I Crossout in the sentence " my most valuable lesson from this class was learning about my writing potential. ?

or:Using prepositional phrases what do I Crossout in the sentence \" my most valuable lesson from this class was learning about my writing potential. ?

or:Your question is incoherent. \"Using prepositional phrases\" has nothing to do with the rest of your question. You don't say why you want to cross out something. A prepositional phrase begins with a preposition and ends with a noun, pronoun, gerund, or clause. \"from this class\" is a prepositional phrase.

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