英语题：even though, even if, as though, as if 的区别,详解~~ 谢谢啦

even though=even if 意思：即使
as though=as if 意思似乎好像
even if/though加句子,要虚拟语气
as though也加句子,
as if可以加句子,是否虚拟,看情况,说事实就不用.
当然也可以用as if to do