Three added to four makes seven 中add为什么加ed啊The bad weather added to our difficulties 还有这个
问题描述：
Three added to four makes seven 中add为什么加ed啊
The bad weather added to our difficulties 还有这个
答
the bad weather added to our difficulties 和three added to four makes seven中的两个不同。
1. three added to four makes seven, 这个added用作形容词做定语。虽然用了过去式，但做形容词。
2. 这个是一般过去时.意思增加，加大的意思。也可以这么写：
Our difficulties were been added by the bad weather.
但the bad weather added to our difficulties 更为形象。
答
正常不应加ed，
因该是原题或原文章出现了错误。
答
你要明白句子的结构
句子成分 主语Three added to four 谓语makes 宾语seven
added是一个被动语态,
答
被动啊,three是被加数.所以,add要用被动语态