america discovered by columbusamerica was discovered by columbus was 去掉行吗,discovered 也是被动的意思吧america discovered by columbus is not accepted by all这样对吧,我觉得后面接is 所以 was 去掉,可以不用which 而直接写America was discovered by columbus is not accepted by all

不能，因为是美洲。
所以现在的是对的，改了就不对了！
应该是：america was discovered by columbus which is not acceptable to all/accepted by all.

America was discovered by Columbus,which is not accepted by all

一个句子只能由一个谓语，这里america discovered by columbus指的意思是哥伦布发现美洲这个观点。整句话的意思是：并非所有人都认为是哥伦布发现了美洲。
america discovered by columbus在这里做主语，不是一个句子，自然不可能用Was.

不行
be done形式才是被动语气
单单一个discovered只能表示discover的过去式，意思就会变成美国发现。。。
有了was，就是美国是被发现

语法没错,但是意思错了!
你的原话:" America discovered by columbus is not accepted by all"
discovered by columbus 这个是做 America 的定语
所以你的原句也就是 America is not accepted by all.
所以你的句子语法是没有错,但是意思却不是你要表达的了!
我想你应该要说 "美洲由哥伦布发现这一事实并不被所有人接受." 吧.
正确的应该是:(The fact that) America is discovered by Columbus is not accepted by all.
这里第一个be 动词用了一般现在时,是因为这里表示的是一个客观真理,所以可以不用一般过去时.

不对！
原来的句子意思是
美洲是哥伦布发现的这个事实并不被所有人承认。
america was discovered by columbus 美洲是哥伦布发现的
如果was 去掉，就变成了：
哥伦布发现的美洲不被所有人承认。
意思不对了
america was discovered by columbus 是一个从句在作主语，如果去掉WAS，那就是一个由过去分词短语修饰的名词在做主语，完全不同！不能单独认为都是被动就可以了。
正确的句子应该是
THAT america discovered by columbus is not accepted by all。从句做主语前面应该还要有that!