although/though/even if/even though
although和though都有虽然的意思，两者的意思很接近，区别也不是很大，一般情况下可以通用。两者的区别是though可以用在句末，但是although不可以，即：Though,but not although can be used at the end of a sentence.
看个例子：
She knew all her friends would be there.She didn't want to go,though.
而且though除了虽然，还有别的意思，比如可以表示转折，意思是“但是”。
even though是“即使”的意思，等同与“even if”
even if 即使
Even if he is poor, he looks happy.
即令他穷，他看上去很快乐。
(经常用在句首)
even though即使
I like her even though she can be annoying.
尽管她有时很恼人，但我还是喜欢她。
（经常用在句中）