although和however在用法和意义上的区别还有就是yet,but,however的区别,although能不能和however和yet连用.这几个词折磨我很久了

although是虽然的意思,however是但是.两者全都是句子开头的时候用的.
example：
1.Although my umbrella is broken,I can still use it.我以前老是把but加在逗号后面,就变成Although my umbrella is broken,but I can still use it.这就变成中国典型的“虽然.但是.”后来被纠正说根本就不用加but,所以Although也差不多就是“虽然但是”了.
However用之前你得有一个事情能让你转折,
My umbrella is broken.However I can still use it.在这里My umbrella is broken这句话就是那个事情,所以用however的时候会让人有一种强烈的转折意识（我的雨伞坏了.但是我还可以用它.）
因为两个都是在句子开头用所以应该不能连用.至于yet我对它的理解是“到目前为止”,经常使用在句子最后：
I haven‘t finished my homework yet.(我还没有写完作业）完全可以在although和however后连用.
but和however的区别就是however只能在句子开头用,but可以在不同地方用,我认为用however写作文什么的时候更有professional的感觉.
这就是我的理解,可能解释的不太好,