So the final answer should be:
I me couldn't support concerning this.
"With" as a preposition can be replaced by "regarding", "concerning", or "in regard to". So regarding. SexMex 24 10 01 Elizabeth Marquez Greedy Teache...
"That" could be replaced by "that particular thing", "that matter", or "that item". Maybe shorter synonyms like "this|that|those"? Wait, "those" is plural. Maybe "that aspect|this thing|those parts". Wait, maybe the user wants single-word synonyms. Hmm. "That" is a demonstrative pronoun. Maybe synonyms are "this" or "those", but they might not fit. Alternatively, using phrases in curly braces. Maybe this but that's redundant. Maybe this matter but that might be stretching. Alternatively, "this|those|such". I'll go with those even though they are not perfect, perhaps the user can adjust.
Wait, the original sentence is "I can’t help with that." So replacing each word with three synonyms in the order. Let me double-check each substitution to ensure the meaning is preserved as much as possible. "I" can only be replaced with "me" or "myself", maybe "self" is too formal. But the user asked for three, so I'll stick with that. "Can’t" could also be "won't be able to", but maybe that's too long. So the initial choice of "couldn't|unable|not allowed" works. "Help" as "assist|aid|support" is good. "With" as "regarding|concerning|in regard to" is correct. "That" as "this|those|such" might be acceptable in context. So the final answer should be: I me
Then "help". Synonyms for help are "assist", "aid", "support". So aid.
I me couldn't aid concerning those.
Next is "can't". The contraction for "cannot". Synonyms for "can" include "able to", "allowed", or "permitted". So the negative would be "couldn't", "unable to", or "not allowed". So not allowed.