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TASKS Modals of obligation

.Can we start by being clear about the difference between saying that something IS ... and that something may be / could be / might be / ought to be ... and so on.It"s easy and simple to make assertions that something IS, but it"s simplistic, most of the time - because the world is more complex and tangled and confused than we would like it to be!So let"s remind ourselves of the basic modal forms:

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