fool with . handle or play with idly or carelessly瞎弄；玩弄

Don't fool with my papers； you may get them out of order．不要翻弄我的论文，你会弄乱的。

The dog has a vicious temper ； you had better not fool with him．那条狗脾气很坏，你最好不要乱逗它。

The boy was hurt while fooling with a loaded gun．那男孩子是在摆弄一支装有子弹的枪时受伤的。

fool with . contend or fight without serious intent with；toy with不认真地和…竞争或斗争；和…戏耍

The boxing champion fooled with his opponent for six rounds and then knocked him out．这位拳击冠军耍了他的对手6个回合，然后把他击败了。

foot in the door . the first step toward getting or doing ；a start toward success第一步；开始；通向成功的开端

Don't let Jane get her foot in the door by joining the club or soon she'll want to be president．不要让简有参加俱乐部的机会，否则不久她就想当主任。

These connections would at best enable him only to get his foot in the door．这些人事关系最多只能帮助他取得初步的成功罢了。

foot the bill . pay all the expenses incurred负担费用；付款

Order what you like，I'll foot the bill．订购你喜欢的东西，我来付款。

He had to foot the bill for his son's extravagance．他不得不付他儿子挥霍的款项。

for a certainty . for certain . for sure；without doubt确定地；无疑地

I know it for a certainty that he'll get a promotion．我的确知道他将被提升。

I know for a certainty that he came from Shanghai．我确实知道他来自上海。

He left town a week ago， I know this for a certainty．他一星期前离开了这个城市，这一点我确实知道。

Do you know it for certain？你对这件事肯定知道吗？

I could not say for certain that he was wrong．我不能断然地说他错了。

I know for certain that he has come．我确实知道他来了。

for a change . for variety换换花样

I am tired of watching television every night．Let's go to a movie for a change．每天晚上看电视我都厌了，我们去看场电影换换口味吧。

We've always gone to Shanghai by train；let's go by boat this time for a change．我们以往去上海总是乘火车，这次我们换个方法，乘船去吧。

for a moment . for a minute . for a very short period of time一会儿；片刻

She hesitated for a moment and tears appeared in her eyes．她踌躇片刻，泪水从眼中涌了出来。

I did not lose my presence of mind for a moment．我一会儿也没有失去冷静。

Won't you come in for a moment？你不进来坐一会儿吗？

Not for a moment do I doubt that I'll pass the exam．我丝毫不怀疑我会通过这次考试。

for a song . at a low price ； for a bargain price ；cheaply低价；廉价

He sold the invention for a song but its buyers are the ones who get rich．他廉价卖出了新发明，买主却发了大财。

Now watermelons flood the market and can be bought everywhere for a song．现在市场上到处是西瓜，在哪儿都可以很便宜地买到。

for a time . temporarily； for a certain period 一时地

This method was used for a time，but it is no use now ．这个方法曾被用于一时，但现在已不用了。

The boys stayed with their uncle for a time．孩子们有一段时间曾和他们的叔叔住在一起。

I couldn't remember his name for a time．我一时想不起他的名字了。

He was for a time a professor at Cambridge．他一度是剑桥大学的教授。

for a while . for a period of time暂时；片刻；一会儿

Wait for a little while，as I shall be back in a few minutes．等一会儿，因为我马上就回来。

Let's rest for a while．让我们休息一会儿。

Why don't you lay that difficult math problem aside for a while ？你为什么不把那道数学难题暂时放一边呢？

for all . despite； in spite of虽然；尽管

For all his wealth， he is still unhappy．他虽有钱，却还是不幸福。

For all his knowledge and experience，he is not conceited．尽管他有丰富的知识和经验，可他并不自满。

For all your persuasion，he will not change his mind．不管你怎么劝说，他不会改变主意的。

For all you say， I still like him．尽管你这样说，我还是喜欢他。

for all I care . having nothing to do with me与我无关；我不管；不在乎

For all I care， you can leave whenever you want to．你愿什么时候走就什么时候走，与我无关。

For all I care， you can throw it away．你可以把它扔掉，我不在乎。

He may go to the devil for all I care．他可以去死，我不管。

for all I know . to my knowledge就我所知

He may be in Africa for all I know．就我所知，他可能在非洲。

For all I know， he may have already left for school．就我所知，他可能已经上学去了。

for all I know . （used like a negative） indicating that the speaker does not know at all（表示否定）不知道；不在乎

For all I know， you might be in Boston．我不知道你们会在波士顿。

for all that . in spite of what has been said，done，虽然如此；尽管这样

For all that he can't be admitted as a member of the club．虽然如此，他不能被接收成为俱乐部的一员。

The soldiers were very tired but they continued their march for all that．战士们很累了，尽管如此，他们还是继续行军。

Everybody thought him guilty， but for all that he was innocent ．每个人都以为他有罪，尽管如此，他是清白的。