how can this be和how could this be这两个有什麼区别.是不是could语气委婉些?还是过去式?

How can this be true? how can this be和how could this be这两个有什麼区别.是不是could语气委婉些?还是过去式? how can that be? how can it be.. how can be how can that be how can they be what? How can I be like this now ! 求翻译 How can this be 里面都用到了什么语法? how will this ……比如时态。我见过How could this be的例子，how will this be这个对吗？我纠结在how will this be和how this will be之间 How can it be that? How can schools be improved? how can this be when we were meant to be中文意思同上. how can this be when we were neant to be请问这句话怎么翻译. how about和how+be的区别 I wanna be an expert on English,how I can do this?Is there anybody who can help meon this? I know from my own e____ how difficult this kind of work can be . How many squares of side 3 cm can be cut out from this rectangle?求译