needn't是等于don't need to还是don't need.为什么?“你不必为他的学习担心”是you needn't to worry
问题描述：
needn't是等于don't need to还是don't need.为什么?“你不必为他的学习担心”是you needn't to worry
“你不必为他的学习担心”是you needn't to worry about his study还是you needn't worry about his study?
答
don't need to中的need是实义动词
needn't中的need是情态动词
没有don't need.
所以是you needn't worry about his study.