有没有be heard doing?

有没有be heard doing? be heard doing /do 有具体时间用doing? 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 有没有be heard doing的说法看一个例句：he is heard to sing now./he was heard to sing just now 这里为什么用sing,我想都是短暂的动作不应该用singsing吗? be heard to do sth 还是 be heard doing sth? 有没有sb be considered doing 用法? 有没有be busy with doing sth? 有没有be informed of doing 有没有be busy doing这个词组 i heard someone calling me 为什么没有be?根据be doing sth 不是应该写成 i heard someone was calling me be look forward to doing这个对不对有没有这个 有没有be difficult doing?请翻译、举例 有没有sb.be succeeded in doing sth.的词组? be sth terrified of doing有没有这种用法 有没有be busy in doing sth.（忘了-_- be used to doing 有没有被动语态和现在完成时 有没有这样的句型There be +名词+doing sth 请问有没有need to be doing sth这种用法