我觉得下面句子中的副词 unfortunately 位置用得不对：
I am unfortunately unable to accept your kind invitation. 很遗憾，我不能接受您的盛情邀请。
我觉得应该将 unfortunately 放在句首才对：
Unfortunately, I am unable to accept your kind invitat...
... did as it was asked that he did.（只是按照这样来理解，这样写的句子肯定不能用，下同）he did as he was asked to do.he did as told.可否按照如下理解：he did as it was told that he did.he did as he was told to do.
为什么字典上标注的副词，但是他的用法看着不是呢？
They have introduced a new system whereby all employees must undergo regular training.
a proposal whereby EU citizens would be allowed to reside anywhere in the EU
它应该怎么用？
Clever as he was, he found it difficult to solve the problem.这里用过去时是不是不太好？(暗示he现在不clever了?)我觉得应该用现在时，改成下面这样：Clever as he is, he found it difficult to solve the problem.请问我理解得对吗？
老师说下面句子中的 the dead 意思是“死者”，泛指所有的“死者”，不指单个的“死者”：Some festivals are held to honour the dead or to satisfy the ancestors, who might return either to help or to do harm. 有些节目是为了纪念死者，或使祖先得到满足...