老师晚上好：看到这个句子：Water is necessary for life.学生有了疑问：因为曾看到过这样的论述——主语为具体的物，介词用to。如：The book is important to me.主语为抽象的事，介词用for。如：Studyig English is important for me.望老师点拨。
there is no question,however,that three years into this effort we stand united,73 members from around the global in common purpose the destruction of ISIS and the protection of our own citizens and homelands through our cooperation.
请问这是个什么句子 and hence后为什么主谓都省略了? and hence中的and和谁是并列关系？ Under modern conditions,this
requires varying measures of centralized control and hence the help of
specialized scientists such as economists and operational research experts.
...nd making sure the President is paying attention or at least
doesn't think of himself as above the law.上面，as是否多余？可否直接说成think of himself
above the law ?如果as是必须的，为什么后面可以直接加上介词词组above the law, 而不是as sth - sth需要是名词...
Scientists may have the right to investigate anything within their means, but that does not mean that they also have the right to the means to investigate anything they choose.后半句have the right to the means to investigate中to the means是不是多余了，这里的means作何解？
有网友提出这个句子：I shouldn’t always have to tell you what to do. 网友问：shouldn't have to 是什么意思，什么情况使用它？见：http://ask.yygrammar.com/q-24691.html曹老师的解答认为：网友的这个句子：I shouldn’t always have to tell you what to...
They should have done more research.I ought to have left here by 3.30.Surely they should have got home by midnight.请问这三句中should / ought to have done表达的语法意义是一样的吗？
...联语言学家乔姆斯基曾经说过：Language
is the perfect system of vocabulary combined with grammar（语言就是词汇跟语法所构成的完美体系）.英国语言学家A.D. Wilkens也说过：Nothing can be conveyed
without vocabulary; little can be conveyed without grammar（没有...