动词后什么时候加ing,什么时候不加,为什么?

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…

be动词(is.am.are).介词后面加ing形式。还有固定的词组搭配要记住 某些动词后出现非限定性动词时只能用动名词作宾语，不能用不定式。常见的此类动词有：advise, allow, permit, avoid, consider, enjoy, finish, give up, cannot help, imagine, include, keep, keep on, mind, miss, put off, delay, practise, resist, suggest, depend on, think about, set about, succeed in, worry about, burst out, insist on, can’t stand, be used to, get used to, devote…to…, look forward to, pay attention to, get down to等。如： they went on walking and never stopped talking. 他们继续走，说个不停。 i found it pleasant walking along the seashore. 在海滩上走真是乐事。 （2）作介词的宾语 we are thinking of making a new plan for the next term. 我们正考虑为下学期制定新的计划。 shall we have a rest or get down to doing our work? 我们休息呢还是开始干活？ （3）作形容词的宾语 the music is well worth listening to more than once. 这种曲子很值得多听几遍。 we are busy preparing for the coming sports meet. 我们正为马上到来的运动会忙着做准备。 3、作表语 动名词作表语时句子主语常是表示无生命的事物的名词或what引导的名词性从句。表语动名词与主语通常是对等的关系，表示主语的内容，主语、表语可互换位置。 your task is cleaning the windows. 你的任务就是擦窗户。(cleaning the windows is your task.) what i hate most is being laughed at. 我最痛恨的就是被别人嘲笑。 (being laughed at is what i hate most.) 4、作定语 动名词作定语往往表示被修饰词的某种用途。如： a walking stick ＝a stick for walking=a stick which is used for walking a washing machine=a machine for washing=a machine which is used for washing a reading room=a room for reading=a room which is used for reading a measuring tape=a tape for measuring=a tape which is used for measuring sleeping pills=pills for sleeping=pills which is used for sleeping

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）