1.It's impolite of them to wear hats in the pagoda(shouldn't) ->

2.Children have to live with their parents until they reach the age of 18(obliged)

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3.Is it necessary for me to tip in a coffee shop?(have to)

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4.It's not mandatory for staff to wear vests in their company(need)

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5.It's good for us to keep our traditional customs(should)

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London includes a quote about john thornton as he is observing hal attempt to motivate the exhausted dogs "it was idle, he knew, to get between a fool and his folly". if the word "idle" is defined as "of no real worth, importance, or significance", what does this statement mean with regard to hal? who is the fool? what is hal's folly? why would john thornton think it of no real worth or useless to intervene?