It is not long before they are so accustomed to swimming 这里的it is为什么在前面,是什么用法

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• It is not long before they are so accustomed to swimming 这里的it is为什么在前面,是什么用法
• It is not long before they are so accustomed to swimming 这里的it is为什么在前面,是什么用法
• bore的意思是什么The muscles will ply the short wings with such irresistible power that they can bore for long distances through an opposing gale before exhaustion follows.请问bore在这里的用法,为什么can 后面可以跟bore?这些肌肉给短小的翅膀提供巨大的力量，以至于他们能顶着大风“凿”很远的路程不会疲劳？不通吧
• 请问形容词后面的that从句是什么从句I am sure that I will pass the exam.I am sorry that I have troubled you so long.有人说宾语从句,有人说状语从句,还有人说表语从句..很困惑啊...像make sure,make certain的用法make在这里做什么成分,为什么可以接形容词
• it won't be long before/do something and you will do/dream这三个的具体意思和具体用法 还有相关词组
• it is not long before they are so accustomed to swimming 这里to后面的swim怎么可以用ing形式呢?