he needs to go to school和 he need go to school

意思一样,都是说他需要去上学.两句可以随时转换.第一句need做实意动词,实意动词的动词时态需要根据人称变化,need做实意动词的用法是somebody need(s) to do something；第二句need做情态动词,情态动词的动词时态不需要根据人称变化,need做情态动词的用法是somebody need do something.
应该很详细了吧,