"Good air" days are those when the daily concentration of PM2.5-airborne particles of 2.5 microns in diameter or smaller that are harmful to health-is below 75 micrograms per cubic meter, while "severely polluted" is higher than 150 mcg per cum这句when the daily concentration o...
...者不可数名词；表示各种食品时，要用复数形式。例如：Therearenot enough food for everyone. 食品不够所有人吃。（不要说：enough foods）（摘自《朗文当代高级英语辞典》第6版）The restaurant serves good food at affordable prices. 那家餐厅物美...
...r-reaching has been the inexorable decline
in the scope and seriousness oftheir arts coverage.
请教各位老师，在这个句子中，句首的“Of all the changes”应该理解为何种句子成分呢？又是属于一种什么语法现象呢？
If the 80s were the age of stress, this is the age of anxiety, with 30% of Britons experiencing an anxiety disorder during their lifetime.这里the 80s的谓语动词用复数吗？一般时间不都是用单数吗？还是这里有虚拟语气的用法？
...9;s the price ofthe+名词单数？如果对复数价格提问，有 What arethe prices ofthe shoes? 这种说法吗？还是说 What's the price ofthe shoes?如果询问苹果、桌子等其他可数名词价格时，用 What arethe prices ofthe apples / desks? 行不行的呢？还是干...
...r. Though
Mrs. Busssman fully acquainted with this story, she thought that there was a chance in a million that she might be
right.1)After
they had gone on - 这句话没看懂在课文中go on指的是什么？为什么不用一般过去时呢？that she
might be right 同位语从句的先行词...
...是复数？如：1. Hundreds of thousands of people ______ at risk. (is / are)2. Millions of gallons of water ______ kept back by the dam. (is / are)第1题肯定选are，这没有问题；第2题呢？怎么选？
...们矛盾的一个大的来源。”At the time,they were both young—in their early twenties—and still-learning
how to manage their personal finances. So they created a new account solely to
hold money for joint expenses like mortgage payments and utilities.那时，他们都很年轻，才二...
1. Love not time heals all the wounds.老师提到过没有and 就不能并列，那此句的 not 是什么用法？它也不是连词，为什么可以让 love 和 time 在一样的成分上呢？2. He said no word. 我可以理解成 no 做名词 word 的定语吗？但 He said not a word 这里...
Only then did I realize how dangerous the situation had been.On no account must you accept any money if he offers it.如以上例句,如果不倒装,only then 和 on no account,除了放在句末,还能放在其他位置吗?能否像这样随意调换位置? I only then realize... I realiz...
In an experiment, pet owners are being encouraged to take their pets to work, a move that some scientists say can be good for both the people and the pets.这里的a move为什么分析为定语从句的主语呢？ 难道不是say的宾语吗？ 我觉得that some scientists say是move的定...
None would have dreamed ofthere being such a place.此句中，there being 是否为there be结构？如果是，of 后边是否可以接：there is such a place(省略了先行词that)？如果可以这样接，是否所有宾语从句都可以变为这种动名词形式？