need to be done 中的done 表示什么

need to be done 中的done 表示什么 need to be done need to be done.是什么意思? need doing 和 need to be done有什么区别? to done to be done to being done 三个表示什么时候?什么意 need doing 和need to be done need doing to/be done 用在什么句型上 have something done和need to be done need to be done 造两个句子 sth need to be done的意思 need to be done的问题 need be done