Proper nouns in the sentence: The original sentence doesn't have any proper nouns. So all words are fair game.
Next word is "can't." The contraction of "cannot," so synonyms could be "can't, cannot, am unable to." But the user wants 3 options. Maybe "can't, cannot, am unable" would be three. But "can't" and "cannot" are the same. Maybe use "am unable, can't, cannot" but need three different ones. Hmm. Maybe "can't, cannot, am not able." Mofos 23 02 16 Emma Bugg Public Night School Fu...
"that" is a demonstrative pronoun. Alternatives: "that, it, this." But need three options. Wait, "that" can also be "that, it, the one." Hmm, but maybe "that, it, it." No, needs to be three distinct options. Maybe "that, it, this" again. But "it" and "this" are different. Maybe "that, it, this." Proper nouns in the sentence: The original sentence
with → Regarding
"I" → three pronouns, correct.
