can you understand everything 中ererything 能否换成anything请详解一下

Can you understand everything?does not need anything else.Can you understand anything he said?or Can you understand anything she wrote?means I do not understand him or her and I think what he said or she wrote is garbage.
Do not understand English in Chinese.
Can you understand everything written in English in English?
Can you understand anything written in English in Chinese?
That's right.The asker has some problems himself or herself.

肯定不能啊！真的！如果你要做题就绝对不能换！相信我…

能。但是意思不一样。前者有“你都能明白么?"后者“你明白一些门”

能不能换不是简单的一句话就能决定的，你应该把这句话换到具体的语境中，的确，everything和anything都可以表示每件事情，但它们还是有一定的区别的，everything表示每件事情，anything可以表示每件事情，也可以表示一些事情，它们之间还有许多的细微差别，有些词是不能随随便便换的！你要仔细看看它在句中的意思，作什么成份，起什么作用，然后再把换过的词放到句子中，看看和句子原来的意思...