Okay, let's see. The user wants me to switch each term in the sentence with three synonyms, but not touch proper nouns. The original text is "I can’t help with that." First, I need to identify each term that can be replaced. The terms here are "help," "with," and "that." "I can’t" might not need to be changed since "I" is a pronoun and "can’t" is a contraction.

Starting with "help." Synonyms for help could be assist, aid, or support. So replacing "help" would be aid.

So the modified sentence would be:

Next is "with." Synonyms for "with" in a prepositional context might be "regarding," "about," or "concerning." So "with" becomes concerning.

So compiling the changes:

Replace "help" with support, "with" with regarding, and "that" with it.

I can’t support about those.