although、even if和even though有什么区别在用法和意思有什么区别?有没有哪个可以用句首或者不可以之类的？

although和even if 区别 although 和even though 和even if 的区别 although、even if和even though的用法although、even if和even though有什么区别 even though,although,though和even if的详细用法和区别 although,though,even if hough的区别 even if与although的用法差别 though、although、despite、even if的区别 though和although和 even if的区别 以及when和while的区别 though.although.even though.even if的区别 though,although,as,even if,even though有何区别? even if even though though 和although它们之间的区别if,even though,though 和although它们之间的区别.最好能举例.还有它们能互相替换吗? even if,though,although用法有什么不同? although与even if的区别有劳各位了；俄 although,even if与while可以连用吗 as if 和even even if和although用法的不同?____there is enough food in the world for everybody,not everyone can afford to buy it.A.Although B.Even if.谁能告诉我为什么不能选B以及它们的区别. although、even if和even though有什么区别在用法和意思有什么区别?有没有哪个可以用句首或者不可以之类的？ although / though / even though / even if / in spite of / 这几个词意思都一样吗?