实义动词什么时侯用,情态动词,needˊt do和does't need to do区别 need do和need to do区别

问题描述:

实义动词什么时侯用,情态动词,needˊt do和does't need to do区别 need do和need to do区别

neednˊt do是情态动词的否定式加动词原形.does't need to do是实义动词的否定式
need do是情态动词 ,need to do是实义动词