Since were now about done with the eighth grade, that, my friend, makes more than half a decade of strategic avoidance and social discomfort.
疑问：that 和 my friend 在这个句子里面充当什么成分？还有这个句子的整体结构是哪种？
Since were now about done with the eighth grade, that, my friend, makes more than half a decade of strategic avoidance of social discomfort.
【翻译】既然大家目前已经完成了初二的学业，那样，我的朋友，这就让大家在长达五年多的时间里重点性地逃避了社交焦虑。
【剖析】句子总体是个含有缘由状语从句的复合句。其中，Since were now about done with the eighth grade是从句；that, my friend, makes more than half a decade of strategic avoidance of social discomfort.是主句。
1. 我觉得，原句的strategic avoidance 和social discomfort之间，不是并列关系（讲不通），不可以用and，而是of：strategic avoidance of social discomfort —— 这个词组是说：“逃避社交焦虑；对社交焦虑的逃避。” avoidance 和 social discomfort 是“动宾关系”。
2. be done with：完成；结束。done是形容词。
3. 主句的主语是that，指代整个since从句。that指代前文的句子，这在英语中非常容易见到。又如：
If the man is only interested in your looks, that just shows how shallow he is.
假如男性只对你的外表有兴趣，那就说明他是多么肤浅。
Kevin broke the glass, but he didnt admit itand that was very annoying.
凯文打碎了玻璃，自己还否认，真是太气人了。
I wish I could be there to celebrate your birthday with you, but that is impossible.
我很期望能参加你的过生日庆祝会，但我来不了。
4. my friend 是插入语。可以省略而句子维持完整。
5. makes：产生；做到；达成。
6. makes more than half a decade of strategic avoidance of social discomfort：做到了5年之久的逃避社交焦虑。
总之，这句话意思是说：为了逃避对现实的不适应，大家到了一个地方学习某种常识技能，目前已经8年了。
