新概念二24课《不幸中的万幸》It could be worse，用到了could虚拟语气，第54课《黏糊的手指》课文中出现了nothing could
have been more annoying，用到了could have对过去的虚拟语气。两篇短文都是在叙述过去，为什么前者使用could be对现在的...
...untry to develop faster. 被拿来当作介词短语不能充当主语的典型句子。但我在另一本书上看到过另一个句子是Only by doing so can universities maintain dynamic and sustainable development.是正确的。假如说第一个句子是错误的，为什么第二个句...
A(主语)B（谓语）the basic themes and preoccupations of an unfolding , dominant puritan tradition in American intellectual life.解析说：红色的是宾语，绿色的是宾语的后置定语，为啥这后置定语之间要加个逗号，这是什么语法知识呢？
As we discussed before,it was not until the 19th century that the
newspaper became the dominant pre-electronic media, following in the wake of
the pamphlet and the book and in the company of the periodical.有这3种可能：1.the newspaper2.the dominant pre-electronic3.the newspaper became the domi...
...r A.had gone B.have gone C.went D.will go 选的c，当然c肯定是对的，但我有别的疑问I have called him three times this morning 这句是语法书里看到的。我的理解是现在完成时当用的瞬间动词在有次数的重复标示时表示重...