Simone
soon是指很快就会发生什么事情，比如．．my mother is coming soon我妈很快就来了
later是指稍后或者下次，但是不太确定是什么时候会开始的事，如i will tell you later，我以后再告诉你，我下次再告诉你．．
明白？
意思差不多，用法不同。later on单独用，later跟在时间后，或句尾
◆later
adv.
后来，过后
"Many years later, in Washington, D.C., he spoke to a crowd of 250,000 people."
"许多年以后,在华盛顿特区,他向二十五万美国人民发表了演说。"
"Later, the Crystal Palace was moved to South London."
后来`水晶宫'搬到了伦敦南郊。
"Two months later, some more money was sent to Sam with another note: 'Only 25 per cent a thief now!'"
"两个月之后又送来一些钱,并附上一张字条给萨姆:`现在仅仅是个25%的小偷!'"
But some time later it began to rain.
但过了些时候开始下雨了。
◆later on
后来，以后
I'll tell you all about it later on.
晚些时候我再把有关这一切告诉你。
◆你看一下例句吧希望对你有所帮助。
