Prepositional phrases are sentences that include prepositions. In the second sentence the pronoun 'she' should be replaced by 'her,' and in the last sentence, we should be replaced by us.
What are pronouns?
Pronouns are the words that are used to substitute the irrelevant repetition of the nouns in the sentence. I, we, her, she, us, we, his, etc. are some examples of pronouns.
In the second sentence, the word she is the wrong pronoun and must be replaced by her. In the fourth sentence, the pronoun we must be replaced by us as the sentence is about two persons.
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