The only thing I can do is (to) do it alone.为什么不能要括号中的to?We have no choice but (swimming) across the river.为什么要用原型而不能用ing形式?I'm looking for something which to clean the curtain.哪里有错?为什么要

The only thing I can do is wish you happy the only thing I can still hold for myself. Study.is.the.only.thing.what.I.can.do.now! the thing make you unhappiness.only can I say :i couldn't do that again! 求翻译 Encouraging you is the only thing I can do. Maybe this is the only thing that i can do now啥意思? The only thing I can think about right now is mosquitoes!译 The only thing I can do is to get out of your life的意思 Your love is the only thing I can not fight 是啥意思? the only thing i care about 歌词 in fact,the only thing i do care about is the fact that i can not care about anything I think the only thing I can do is hold you tight.is后面加to吗 为什么 The only thing I can beat you is that I love you more than you love me. the only thing that can hurt me is i'm the only thing i'm afraid The only thing that I can do is give you some money.为什么可以省略to?这是formal the only thing that i can think of for it to be fair is to just vote The only thing I can do is...后面接动词什么型啊?原型、ing、不定式?还是其他什么?