whereas与 however之区别：
1、释义
whereas conj. 然而, 反之, 鉴于, 尽管, 但是
however adv. 无论如何, 可是, 仍然, 究竟 conj. 不管用何种方法, 然而, 可是
2、用法
whereas一般用于句中，引导一个从句
however一般用于开头，引导一个单独的句子
3、区别
however: 然而，意思相当于but
whereas：既有然而，也有尽管的意思，但它与前两个词有本质的区别，前两个词都是副词，不能直接连接句子，而whereas是连词，可以直接连接句子
扩展资料：
however作副词的例句
They, however, maintained a distance from us. 然而他们(在思想感情上)与我们仍有距离。
I'd like to go with you; however, my hands are full. 我很想和你一块儿去，可是我忙不过来。
However, I have no idea where to go. 但是，我拿不定主意去哪儿。
however作连词的例句
however引导让步状语从句，表示“无论如何”、“不管怎样”。和nomatterhow同义。
However fast you drive, I always feel safe with you. 无论你把车开得多快，和你在一起我永远感到安全。
We always go swimming in the river however cold it is. 无论天气多冷，我们都去河里游泳。
However, you travel, it’ll take you at least two days. 无论你怎么走法，至少都得两天时间。
However, you come, be sure to come early. 不管你怎么来，一定要早来。
参考资料：百度百科—however