请教老师下面三个疑问:1.go back to,go back和back to区别这三者间用法有什么区别?2.当追溯到意时go back to,go back和date back to有何区别?3.get back 和get back to又有何区别?和go back to,go back的区别又是什么?
...ey achieved a breakthrough, Iakovlev's reserve units were not
concentrated to exploit it. 请教老师们,我以下的分析是否正确?上面这个句子中even if引导的让步状语从句,if后用的是表示和事实相反的虚拟语气,因此句子省略if然后把had提前。仿照...
Seemingly ,he convinced them.如果用seem来改的话 He seems to have convinced them. He seemed to convince them.是不是改成以上两句都行,怎么感觉第2句有点奇怪, 后面不定式是动态动词, 按照一般的理解,应该发生在主句谓语动词之后, 这...