请问一句英语：Wars have not been abolished,labor troubles have not

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请问一句英语：Wars have not been abolished,labor troubles have not adated,and racial tensions
are still with us.不是只能三个词组或短语用逗号隔开,然后用一个and连接么,三个句子也可以这样写吗?

在英文里,两句句子间通常用连接词而不用逗号.但是,三个句子以上的连接,都要用逗号,而且在连接最后一句时,不但要用逗号,还要用连词.比如：xxxxx,xxxxx,and xxxxx.

请问一句英语：Wars have not been abolished,labor troubles have not have not been to must not have been;could not have i have not been to shanghai.这句英语为什么要用 been may not have been...与 may have not been ... i have been not well JOHN HAS NERE BEEN TO SPACE MUSEUM.I HAVE NOT,EITHER (合为一句）请分析这句英语的语法The cave might never have been discovered had not 英语.would (not) have Hardware changes might not have been detected ---------- l would not have been very tired variable con might not have been initialized