第一句：MALE PROFESSOR: Since Earth formed, some four and a half billion years ago, the number of minerals here has increased dramatically, from a few dozen relatively simple minerals early on...to over 4,300 kinds of minerals we can identify today-many of them wonderfully complex.教授:&n...
...sted strongly against it. 此处为什么要把should 去掉?并且有时态的变化? ②It is foolish of the girl not to have asked your name. 答案:
Foolishly,the girl did not asked your name. 否定形式应该怎样改写呢? 英语基础不太好，希望老师能够...
...怪怪的。Rivals have been fighting in the Central African Republic since 2013. In the chaos the school teachers have quietly disappeared so now parents are going through crash courses to replace them.to replace them是目的状语or定语？A top UN official told senior North Korea...
There can't have been so many people in the street so late at night.There can't be so many people in the street so late at night.请问此例句中，用 have been 和 be 句意上有什么不同？ 常态的事件不应该用一般时态吗？
...he slipped on the icy step.在这个句子中，将 leaving 改写成进行时态是可以的，但对于改写成一般过去时有疑问:As she was leaving the house, she slipped on the icy step.（无疑问）As she left the house, she slipped on the icy step.（有疑问）对于上面的第二...