什么时候要加"ing",如:Tom and Mike like playing ping-pong.

一、以下动词习惯上只接动名词作宾语：
admit 承认 advise 建议
allow 允许 appreciate 感激
avoid 避免 consider 考虑
delay 推迟 deny 否认
discuss 讨论 dislike 不喜欢
enjoy 喜爱 escape 逃脱
excuse 原谅 fancy 设想
finish 完成 forbid 禁止
forgive 原谅 give up 放弃
imagine 想象 keep 保持
mention 提及 mind 介意
miss 没赶上 pardon 原谅
permit 允许 practise 练习
prevent 阻止 prohibit 禁止
put off 推迟 report 报告
risk 冒险 stop 停止
suggest 建议 understand 理解
例句：
I advise waiting a few more days. 我建议再等几天.
I admit breaking the window. 我承认窗子是我打破的.
Try to imagine being on the moon. 设法想象你是在月球上.
He tried to escape being punished. 他设法逃避惩罚.
You shouldn’t keep thinking about it. 你不应老想着这事.
Would you mind going with her? 你可否同她一起去?
I can’t understand neglecting children like that. 对孩子那样毫不经心,我不能理解.
We only missed seeing each other by five minutes. 我们只因差五分钟而未能见面.
二、以下动词通常只接不定式(而不是动名词)作宾语：
afford 负担得起 agree 同意
arrange 安排,设法 ask 要求
care 想要 choose 决定
decide 决定 demand 要求
determine 决心 expect 期待
fail 未能 help 帮助
hesitate 犹豫 hope 希望
long 渴望 manage 设法
offer 主动提出 plan 计划
prepare 准备 pretend 假装
promise 答应 refuse 拒绝
want 想要 wish希望
例句：
I can't afford to buy a car. 我买不起汽车.
She refused to help me. 她不肯帮助我.
He agreed to come over right away. 他同意马上就来.
He managed to avoid an accident. 他设法避免了一次事故.
The boy decided not to become a sailor. 那孩子决定将来不当水手.
He chose not to go abroad until later. 他决定晚点出国.
He pretended not to know the facts. 他佯装不知实情.
三、以下动词接不定式和动名词均可,且含义相同
like 喜欢 love 喜欢
hate 憎恨 prefer 宁可
begin 开始 start 开始
continue 继续 can't bear 不能忍受
bother 麻烦 intend 想要
attempt 试图 cease 停止
例句：
He likes to sing [singing]. 他喜欢唱歌.
It has started to rain [raining]. 开始下雨了.
You needn't bother to come up [coming up]. 你不必费心来了.
The baby continued to cry [crying] all night. 这孩子哭了一整夜.
注：(1) 当 like, love, hate, prefer 与 would, should 连用时,其后只能接不定式：
I’d like to tell you something. 我想告诉你一些情况.
I'd hate to spend Christmas alone. 我不喜欢一个人过圣诞节.
(2) 当 begin, start 本身为进行时态或后接 know, realize, understand 等静态动词时,其后的动词只能用不定式：
He was beginning to cook. 他开始做饭.
He started to realize that he was wrong. 他开始意识到自己错了.
四、以下动词接不定式和动名词均可,但含义不同
(1) remember(记得),forget(忘记),regret(后悔)后接不定式指该不定式所表示的动作还未发生,后接动名词(有时可用完成式),则指该动名词所表示的动作已经发生.比较：
Remember to post the letter. 记住把这封信寄了.(“寄信”未发生)
I remember posting the letter. 我记得寄了那封信.(“寄信”已发生)
He forgot to pay me the money. 他忘记要给我付钱了.(“付钱”未发生)
He forgot paying me the money. 他忘记曾给我付过钱.(“付钱”发生了)
(2) try 后接不定式表示设法做某事,接动名词表示做某事试试(看有什么效果)：
I'll try to come tomorrow. 我明天设法来.
Let's try knocking at the back door. 咱们敲敲后门试试.
(3) mean 后接不定式表示打算(想要)做某事,接动名词表示意味着(要)做某事：
He means to be a teacher. 他打算当老师.
He did not mean to hurt you. 他不是有意要伤害你.
This illness will mean going to hospital. 得了这种病就意味着要住院.
(4) stop 后接动名词表示停止做某事,接不定式表示停下正在做的事去做另一事：
He stopped speaking, and there was not a sound in the room. 他停止讲话,房里一点声音也没有了.
He stopped to listen, but there was no more sound. 他停下来听,但再也没有听到什么声音.
注：后接不定式时,不定式不是宾语,而是目的状语.
(5) can't help后接动名词表示禁不住去做某事,接不定式表示不能帮助做某事：
He couldn't help crying when he heard the news. 他听到这个消息时禁不住哭了.
The medicine can't help to get rid of your cold. 这药不能帮你治好感冒.
(6) go on 后接不定式表示做完某事后接着做另一事,接动名词表示继续做正在做的事：
You oughtn't to go on living this way. 你不应该再这样生活下去了.Go on to do the other exercises after you have finished this one. 做完这个练习后, 请接着做其他的练习.
注：也人认为go on doing sth中的doing是现在分词而不是动名词.