This head must have been found in classical times and carefully preserved.她的脑袋一定是在古希腊罗马时代被人发现，并且受到精心保护。这句话不是过去被发现吗，怎么是现在完成时？and carefully preserved 为什么没有 be 动词表被动？
...ied if it were not for help they received from Native Americans that
lived intheir area。我记得虚拟语气语法中说，在主句中使用过去完成时表假使语意，那我想这里是否应写成…if there had been
not help they received…才符合语法习惯呢？还有原句中为...
Such algorithms are critically important in practice because they
enable us to address problem sizes far larger than could be addressed with quadratic solutions.far larger than could be addressed with quadratic solutions. 语法分析，什么问题？
Three months on from a request for such a change, applicants will then
have to appear at a registry office in person. ——From: BBC这里的on from怎么理解？那么three months是修饰后面的介词短语还是说后面的介词短语修饰前面的three months？
They are urging fathers to roll their sleeves up not so much to ease their wives’ burden but to sharpen the child’s competitive edge.请问：句子中的not so much...but...是什么意思？
请教一下：1. Father reasons with us children when we do things wrong 感觉children 在这里很多余？总觉得哪里不对2. Father would be among the God's chosen few, if there were...
At 130 square feet, the house has a rustic cabin meets Pottery Barn catalog feel. It cost under $20,000 to build.请问这句话中meets前是不是缺少了一个关系代词which? 一般which在从句中充当宾语的成分时才可以省略吧？如果没有关系代词，都不清楚has a rusti...
Pausanias, who was a Greek writer about 2,000 years ago, has come on a magical journey on March 18th, 2007 to find out about the present-day Olympic Games.【问题】这是新课标人教版高中英语必修2的句子。这句话使用现在完成时，是否正确？
These days they are required to pay their apprentices the minimum wage, along with teaching them. 请问专家老师，句中 along with 之后的 doing 短语是现在分词还是动名词短语? along with 也可以 with 替代吧？