求有be doing to 的句子.我马上要!

求有be doing to 的句子.我马上要! be heard to do be be heard to be doing be heard doing be heard to doing我知道前两个是对的,后两个存在吗?若存在四个进行比较,有何区别be heard to dobe heard to be doing be heard doing be heard to doing如果不存在，前两 用to be doing 造个句子 初中英语to后加doing的词组有哪些?如look forward to doing,be used to doing,hold on to doing,pay attention to doing的? to be doing 和 doing的区别 allow是to do sth还是doing sth?我知道有be allowed to do sthallowing doing sth和allow sb to do sth的区别 关于devote的一个问题devote to doing和be devoted to doing有什么区别? 急!求be used to do be used to doing used to doing be used for doing 的区别以及用法 happen to do和happen to be doing 的区别?顺便分别解释下.我问的是happen to be doing 不是happen to doing~ demand ,need?demand为什么有主观的意思而need有被动的意思?不是有I need吗...我那个句子里的没有need doing need to be done也有表被动,你这样说不对吧 用be going to have been to to do be doing 分别造三个不同主语不同句式的句子 be able to 的短语有be able to doing 的说法吧 为什么有doing=to be done ●be interested in to do sthbe interested in to do sth和be interested in doing sth有什么区别?常用的是dong sth,但是什么时候用to do sth?书上有个句子是用的to do sth ,我也觉得奇怪才来问的,但绝对是有的. be towards to doing sth 的用法并造个句子吧 be sure to do和be sure of doing 的区别be sure to do和be sure of doing的意义有什么不同 这句子有错误的地方吗?有的帮忙改改 I will also be able to doing something I love.问问有没有错的地方？ be devoted to do 和be devoted to doing的区别?呃 有be devoted to do