1) Difficult to believe as it is... (当然一般说hard to believe)
2) 关于单个as表示让步的用法,你查牛津字典会得到两个例句,并且你只需记住这两个例句就可以。其它的你看到的各种怪七怪八的例句,大多都是国内的大师自己发明的。
Happy as they were, there was something missing.
Try as he might, he couldn't open the door.
这两种结构是使用频率相对较高的
1) 形容词+ as + 主语+be
2) 动词+ as + 主语+might
注意第2种结构中的might,不轻易换成其它情态动词,更不能换成do的形式,这就是外国的说话的方式。Try as he did, he couldn't open the door.这就错了。