different between couldnt vs wouldnt

couldnt

couldnt From the web:

• what couldn't jack sprat eat
• what couldn't the articles of confederation do
• what couldn't congress do
• what couldn't macbeth say
• what couldn't wegener explain
• what could patricians do
• what couldn't rudolph do
• what couldn't fitzgerald forgive zelda for

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wouldnt

wouldnt From the web:

• what wouldn't meatloaf do for love
• what would jesus do
• what wouldn't
• what wouldnt i do for that man
• what would i do
• what wouldn't i give
• what would i do for love
• what would you do for love