But if the students keep going, if businessmen start to wobble and if cracks were to appear in the army, the revolt could enter a new phase.个人按前后文分析，认为前两个 if 句为be- 型虚拟式，第三个 if 句为 were- 型虚拟式。但有其他同学认为前两个 if 句是真...
The patient's condition is getting a little better.The patient's condition is a little getting better. The patient's condition is getting better a little.这三种语法上都可以的吗? 谢谢回答!
...没有打来过电话。”，所以主句用现在完成时。
It wasthe first time I'd had visitors since I'd moved to London.
那是我搬到伦敦以后第一次有人来看我。
这里整个句子是以“it wasthe first time ”做基调，所以since的主从句都过去完成时表...
...详细的解释一下动名词的详细用法。谢谢，原句：How do these concepts apply to
handling a confrontation? If you’re worried about being walked all over, you
might be prone to err too much in the other direction, venting your anger at
the person and exacerbating the situation.请...
“Whatever are you doing up here Bill?” asked the vicar in surprise. 你究竟在这上面干什么，比尔？新概念3 第2课这个up是修饰doing的还是修饰here的？因为看了out at the sea (在外海)，这个out就是修饰at the sea的所有这里的up，就有点不清楚是修...
...人称，不能接接第一人称，如：
可以说：According to him, the bridge is not safe.
不可说：According to me, the bridge is not safe.
但如果是第二人称呢？可以跟在according to的后面吗？比如可以这样说吗？
According to you, the bridge is not safe.
The plan is so unpopular that it wouldn’t be worthwhile our pursuing.这句话用了动名词复合结构our pursuing，正确吗？曹老师讲过（http://ask.yygrammar.com/q-37511.html），可以说The room needs cleaning by you. 但却不能用动名词复合结构：The room needs your clean...
...，也不属于单一的动作。我想了一些表述：I have knocked at the door three times.I have been knocking at the door three times.（但是进行时态又不能和表示次数的状语连用）I knocked at the door three times.请问您上面几种表述有对的吗？