动词后什么时候加ing,什么时候不加,为什么?

doing： 1.There be …doing (主动) There be…+p.p.(被动)
2. have trouble / problem / fun /…time doing
3. 感官动词 see / hear/ notice/ find / feel sb. doing (正在做)
4.put off doing practice doing consider doing keep doing keep sb. doing
finish doing enjoy doing mind doing allow doing give up doing
be busy doing spend…(in) doing end up doing stop doing(停止做)
try doing（试着做）forget doing（忘了做过某事） remember doing（记得做过某事）

p.p. 现在完成时 have/ has +p.p. (since +过去时间点 / in the last few years / over the years / so far / just / ever / never/ already/ yet/ before)
过去完成时 had + p.p.
be+ p.p. 被动语态 get / have sth. + p.p. (让别人做某事)
a boy called / named… (被动意义，过去分词作定语) an organization set up
a book written by…=A book that was written by…

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