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以下摘自金山词霸，希望对你有帮助： Depending on the sense, the verb need behaves sometimes like an auxiliary verb (such as can or may) and sometimes like a main verb (such as want or try). When used as a main verb, needagrees with its subject, takes to before the verb following it, and combines with do in questions, negations, and certain other constructions:
根据语义，动词 need有时当作助动词来使用（如 can或 may)，有时象实义动词（如 want或 try)。当用作实义动词时， need和主语一致，把 to放在其后面动词的前面，在疑问句、否定句或某些特定的造句法上和 do连用：
He needs to go.
他想走。
Does he need to go so soon?
他这么快就要走吗?
He doesn't need to go.When used as an auxiliary verb, needdoes not agree with its subject, does not take to before the verb following it, and does not combine with d
他不需要走。当用作助动词时， need不用和主语一致，不用把 to放在其后动词的前面，并且不用和 do连用：
He needn't go.
他不必走。
Need he go so soon?The auxiliary forms of need are used primarily in present-tense questions, negations, and conditional clauses. They differ subtly in meaning from the main verb forms in that they always refer to an externally imposed obligation. Hence one might say You needn't (or less formally, don't need to) fill out both forms, but where the sense of necessity is internal to the subject, only the main verb can be used:
他这么快就要走吗? Need的助动词形式主要用于现在时态的疑问句、否定句和条件句中。它们在意思上和用作实义动词的形式有细微的区别，它们总指外部加强的压力。因此我们可以说 你没必要（或不太正规的 don't need to) 填两份表格，但是对于物体来说需要的意思是内在的，所以只能用实义动词：
I don't need to (not needn't) be told how to manage my own affairs. Note also that the use of need as an auxiliary is often accompanied by a presupposition that the activity in question has in fact been performed. The boys needn't have spoken frankly implies that they did in fact speak frankly, whereas the sentence The boys did not need to speak frankly does not; only the latter could be followed by a clause like they conveyed their meanings by indirection.
我不需要（而不是 needn't) 被告诉怎知管理自己的事情。还需注意 need用作助动词时经常伴随一个先决条件，质问的动作事实上已经完成了。 那些男孩们本来不需要坦诚相告的意味着他们事实上已经坦率地说了，然而这个句子 男孩们不需要坦诚地说话就没有这个意思；只有后者可以在其后跟这样一个句子，如 他们间接地表达他们的意思 | 
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发表于 2004-5-5 06:24:00
