need作情态动词时，它具备情态动词的所有特点：没有人称和数的变化，后面直接加动词原形，后面直接加not构成否定，提前构成疑问句。如：He need read more books. He needn't finish it today. Need he do it?
need作实义动词时，它具备实义动词的所有特点：有人称和数的变化，借助于助动词dot构成否定，疑问句。如：He needs to read more books. He doesn't need to finish it today. Does he need to do it?
另外，need作实义动词时，可以构成词组： need sth need to do sth need sb to do sth
need做情态动词时，后面直接接动词原形eg:need not/do sth
need做实意动词，need to do sth
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