need既可做情态动词，也可做实义动词
情态动词：need do；needn't do.
We need hurry.我们需要赶快了.
We needn't hurry.我们不必赶忙.
实义动词：need to do; don't need to do.
We need to get enough sleep.我们需要充分地睡眠.
We don't need to do it right now.我们不必现在就做.
而should只能做情态动词，后面不加to
need 也可以作为使义动词，need to do sth
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