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

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
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 do
be heard to be doing
be heard doing
be heard to doing
如果不存在，前两者请比较

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
主动语态中,hear只能接不带to的不定式或动名词作宾语,即：hear sb do ；hear sb doing
在被动语态中,要将不定式前加上to,即：be heard to do；be heard doing

你所提是在被动语态中,所以be heard to doing不存在.
be heard to do 被听说将去做某
be heard to be doing 　是to do 的进行时：被听说正在做某事
be heard doing 被听说（近期）一直在做某事

另,不定式一般时、进行时和完成时的区别
He is believed to come.(=It is believed that he will come.) 要来,还没来
He is believed to be coming.(=It is believed that he is coming.) 正在来路上
He is believed to have come.(= It is believed that he has come.) 已经来了

1.主动语态中，hear只能接不带to的不定式或动名词作宾语即：
hear sb do sth: I heard her sing that song. 我听见过她唱那首歌。
hear sb doing sth ：I heard her singing that song. 我听见她在唱那首歌。
2.但是，在被动语态中，又要将不定式前加上to,就以上面...

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1.主动语态中，hear只能接不带to的不定式或动名词作宾语即：
hear sb do sth: I heard her sing that song. 我听见过她唱那首歌。
hear sb doing sth ：I heard her singing that song. 我听见她在唱那首歌。
2.但是，在被动语态中，又要将不定式前加上to,就以上面两句为例：
She was heard to sing that song. 她被人听到过唱那首歌。
She was heard singing that song。 她正在唱那首歌时被人听到了。

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后面两个应该是不存在的。没有听过这两种句型。