1. since then from then on ever since ever before
since then意为"从那时起"，通常与现在完成时连用，指从过去某一时刻起到现在为止的一段时间。
from then on意为"从那时起"，通常与一般过去时连用，指过去某一时刻之后的时间。
ever since意为"自……以后，从……起"，通常与延续性动词的完成时态连用。
ever before的意思是"在以往任何时候"，常出现在than后面，其中before是副词，有时可以省略，ever用以加强语气。如：
He has disappeared since then.
From then on he refused to talk about the thing.
We’ve been friends ever since we met at school. 
More women are going out to work than ever before.
2.on board on the board on the boards
on board泛指"在船上"，还可指"在飞机或火车上"。这个短语后面也可接船名或船的类型，如：on board the Dongfeng在东风号上，on board a liner在邮轮上。 
on the board除可表示"在(具体的)这艘或那艘船上"外，还可表示"在会上讨论"。 
on the boards中的boards是"剧院，舞台表演"的意思，其本义是"在舞台上"，现常引申为"做演员"或"演出"，常用在连系动词be后作表语。
3. too much much too
too much 意为"太多"，可修饰不可数名词;若修饰可数名词，则用too many。
much too意为"太……"，相当于very。如：
Between ourselves, that young man's hair is much too long.
就咱俩之间说说,那个小伙子的头发实在是太长了。 
Don’t eat too much food.
不要吃太多的食物。
4.on the air in the air in the open air
on the air意为"正在广播"。
in the air意为"在传播中，可感觉到的，流行"。
in the open air意为"在户外"。如：
They were in the open air discussing a problem in the air when the news that a war broke out in Iraq was on the air.
5. at/from a distance in the distance
at/from a distance 是"从远处"的意思，表示有一定的距离或在稍远处。 
in the distance 表示"在远处"，强调距离之远。如：
The painting can be only admired at a distance.
The noise of the car died away in the distance.
6. at any moment at the moment for a moment for the moment in a moment the moment
at any moment 意为"随时，任何时候"，与at any time 及at all times同义。
at the moment 表示"现在，此刻"，用于一般现在时，也可以说成at this moment，相当于now/at present。
for a moment 意为"一会儿"。
for the moment 意为"目前，暂时"。
in a moment 意为"立即，马上"。
the moment 用来引导时间状语从句，意为"一……就……"，相当于as soon as。如：
We can ask him for help at any moment.
I am busy at the moment.
The man was silent for a moment.
For the moment he didn’t know what to say.
Hurry up, the film will start in a moment.
The moment I saw it I knew that there was no hope.
7.care about care for take care of
care about 意为"关心，在乎"，指由于某事重要，或是因责任所在而关心计较。
care for 意为"喜欢，照顾"。
take care of 意为"照料"，相当于look after。如：
He doesn’t care about his clothes.
I don’t really care for red wine.
Take care of yourself!
8.catch up with keep up with come up with
catch up with意为"赶上"，指从后面追上或改变落后的状况。
keep up with 意为"跟上"，指齐步前进，并驾齐驱，不致落后或掉队。另外keep up with 还可以表示"与……保持联系"。
come up with意为"提出，想出(计划、答复等)"。如：
We have done all we could to catch up with them.
I think it important that we keep up with the times.
The programmer comes up with a solution to the problem.
9.take the place of take one’s place take place
take the place of sb./sth.相当于 take sb.’s/sth.’s place，即"代替某人或某物"。
take one’s place意为"就位"。
take place"(尤指根据安排或计划)发生"， 用作不及物动词，没有被动语态。如：
Tractors have now taken the place of horses and cows in most villages.
Take your place, please. We are about to start.
This took place in London.[
10.out of question out of the question
out of question意为"毫无疑问，肯定"。
out of the question意为"不可能，不值得讨论"。如：
His honesty is out of question.
他的诚实是毫无疑问的。
It is out of the question for him to stay in office so late.
他不可能这么晚还待在办公室。
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