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'I find it beautiful,' I said. 'A man can never have too many ties.'
'And a woman can't have too many hats,' she answered.
Ten minutes later we walked out of the shop together. My wife was wearing a hat that looked like a lighthouse!
“我们不应该买我们不需要的东西, “我突然发表意见说, 但马上又后悔说了这话.
‘We mustn’t buy things (that)we don't need,' I remarked suddenly. I regretted saying it almost at once.
need做情态动词时，仅用于否定句和疑问句，只有现在时，过去式要用needn't have，
疑问式用need+人称+do?
否定式用need not (needn't），如：
—Need we leave soon?
—Yes, you must.—No, you needn't
做实义动词时，其变化与一般的实义动词相同，后接带to的不定式
need to do…
don’t need to…
Do you need to …?
need doing 表被动
