when since before造句?

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when since before造句?
since before when until 这四个单词,选用合适的将下面的三个句子联成一句--放在一个句子里
1.I wanted to ask her what was wrong
2.I hadn't time to do so.
3.She began to sob.
另外想问关于since ,这个到底是在……之前,还是自从……开始?
如since：
It's ten year since I began to play the piano.这句since是什么意思呢？是有10年了，还是说在10年前开始

I hadn't time to ask her what was wrong before she began to sob.
自从……开始!

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