"My mother, who is 50 this year, lives with me now. 这里的先行词my mother就是一个专有名词,其后的定语从句who is 50 this year只能是作为非限制性的定语从句来提供附加信息,不能使用限制性定语从句。"
"A: Don’t you think Prof. Morison's test was too difficult? B: Well, I must admit I had been expecting more than just a passing grade in biology. 精品译文 A:你不觉得莫里森教授上次的那个测验并不是太难吗? B:是啊,我得承认,我当时还想着那次生物考试刚刚及格就可以了呢。"
"Science, in practice, depends far less on the experiments it prepares than on the preparedness of the minds of the men who watch the experiments. 实际上,科学的发展更多的是取决于观察科学实验的科学家的头脑的准备,而不是实验本身的准备。据说牛顿是因为观察到了苹果落下,然后才发现万有引力的。"
"Soon the weeds are back(系动词后面跟副词back) fall asleep 因为这里的fall都是作为系动词,所以其后面不能接副词"