Distinguish four kinds of duties
{"Image DocumentName": "Distinguish four kinds of duties", "Image ImageDescription": "Things you should do even if you don\u2019t promise (e.g., pay taxes) Things you should do because you promised to do so, and provided consideration. Things you should do because you promised, and the promisee has relied, and 90(1) is triggered.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}