1、一般的词表示已经做过的跟doing未做过的跟to do

remember、forget是这样的。

2、而neglect反之。neglect doing是提醒不要忽视做某事。

是的。

neglect

vt.

neglect to do [doing] sth.

忘做某事

Don't neglect paying him a visit now and then.

别忘了时常去看看他。

He neglected to lock the door yesterday.

他昨天忘了锁门。

3、另外《小王子》里有一句话:It is an act too often neglected.旁边注解标的是动词,可这里是动词么

neglected是过去分词,too often neglected是act的后置定语你可以把它看成是一个定语从句的省略:It is an act which is too often neglected