一个句子中有两个动词,两个都要过去式吗?如：The attached is engineering drawing for customer needed change,we have changed and pls confirm by

如果从严正的语法上说,这个句子肯定缺少某些部分.这个句子从整体来看还是看的懂的,the attached is engineering drawing for customer needing changing,we have changed it and pls confirmed by customer.
the attached应该呗当作名词成分 附件,engineering drawing 工程图 customer need change.客户和需要存在的是主动关系所以应该是现在分词needing,need 后面加动词ing 表示被动,这里即需要被改变,后面就不解释了.坐观楼下看法