it long before It is not long before they are so accustomed to swimming that they can pick up

It is not long before they are so accustomed to swimming that they can pick up  

It is not long before they are so austomed to swimming that they can pick up

楼主的句子其实是两个句型的组合。
第一个句型，It will not be / is not long+ before sb do，这其实是个时间状语从句，It will not be / is not long是主句，“（将）不会很久”的意思；before sb do是从句。句型的意思是，“不久，某人就（将）做某事了。”=sb （will） do sth soon。请看例句：（1）It won't be long before Yao Ming returns to the court.“过不了多久，姚明就会返回篮球场。”=Yao Ming will return to the court soon。这个句型还可以用过去式，如：（2）It was not long before they got married。“不久，他们就结婚了。”=They got married soon。这个句型主句还可以用肯定式，如：（2）It was long before my father came back。“过了很久，我爸爸才回来。”所以，楼主这个句子前半句的意思是，“时间不长，他们就能非常熟练地游泳了。”以上句型，it都是表示“时间”的概念。
第二个句型，是so...that 句型，引导结果状语从句，估计楼主已经明白，不再累述。

楼主讲的long before 其实也是一个固定的短语，通常不单独使用，before后面接一般过去时的时间状语从句，句型表达的语境是，在从句动作(这个动作已经过去)发生之前，主句的动作老早就发生了，即“在。。。很久前就。。。；老早就。。。”的意思，通常用于一般过去时或过去完成时态，如：（1）She made the dinner long before her husband came back。“在丈夫回来前，她老早就煮了晚餐。”（1）I had seen the film long before you saw it.“在你看这部电影之前，我早就看过了。”

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It is not long before they are so austomed to swimming that they can pick up weights from the

是的，这里的it 指的就是时间，和it is one o'clock中的it 是一个用法。这里的it没有其他任何意思。

It is not long before they are so austomed to swimming

你好~
如下是我的翻译~可能会有出入~

不久他们如此习惯游泳以致于他们能从水池的地板拾起重物。
It is not long before 意思是：这是前不久

it is not long before they are so austomed to swimming

为你解答。
It is not long before they are so austomed to swimming.
没用多久他们就对游泳习以为常了。
解释：be austomed to （doing）sth，习惯于做某事
这里的to并不是不定式，而是介词，在介词后的动词要变为动名词，做介词的宾语。

it is not long before they are so austomed to swimming。。急

It is not long before they are so austomed to swimming.
没用多久他们就对游泳习以为常了。
解释：be austomed to （doing）sth，习惯于做某事
这里的to并不是不定式，而是介词，在介词后的动词要变为动名词，做介词的宾语。

Thomas Wayne：Why do we fall？So we can learn to pick ourselves up

so we can learn to_____ourselves up. A.take B.get C.wake D.pick

I like to get up early so that I can get plenty of work____before lunch

C
get sth done就是完成某事(让某事被做),就如have sth done。也算是一种固定搭配吧。

( )Look at the songbook on the ground.Can you_______for me? A.pick it up B.pick up it C.pick up

你好 选A pick it up 代词放在片语的中间
你能为我把它捡起来吗

I like to get up early so that I can get plenty of work_______before lunch.

D C D

The film starts at eight so you can pick me up at enty to eight求此句的翻译

电影八时开始，所以你可以在还有二十分钟就到八点的时候接我

pick somebody up 有“接某人的意思”

如满意请采纳谢谢