About the preposition "with" of "help with," is it semantically close to that of "deal with"? Or is close to that of "the matter with you"?
"With" is used in myriad ways in English, only some of them close in function. )
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"With" is used in myriad ways in English, only some of them close in function. The three examples you gave are unrelated, for example:
"Can you help with this coffee table?" (The speaker is moving a coffee table and it's too heavy for her to move by herself.)
"I can't deal with this." (The speaker is unable to handle a situation.)
"What's the matter with you