need to be done.是什么意思?楼下两位的答案好像意思差很多！！！！！！！！

have something done和need to be done如题 请问have to be done ,need to be done怎么使用?是什么时态?表示什么时间段? sth need to be done的意思 need to be done 造两个句子 need to be done否定形式 need to be done 中的done 表示什么 need+to be done和need +doing的区别 need doing 和 need to be done有什么区别? remain to be done是否等于remain doing?need doing是否等于need to be done? need to be done如何变一般疑问句 need doing to/be done 用在什么句型上 need doing to/be done 用在什么句型上 be used to have done是什么用法? need doing need to be done 还有没有单词有类似的用法 主动表被动的词除了need doing=need to be done还有什么词 need to do、need do、need doing、neeed to be done的区别need to do sth need do sth need doing sth neeed to be done 有什么区别, 有没must to be done这种用法的?如果没,那为什么有need to be done? need doing ,need to be done,need to do 三者的区别?讲的要详细点. pretend to be done是什么时态?pretend to be doing pretend to have done pretend to have been done呢?