Patrick and colleagues at Penn State surveyed 651 college freshmen both before and after spring break.They were able to control for student behavior before spring break, which was a strong predictor of behavior during break.
请问这里为何用control for呢，control不是及物动词吗...
Calls and emails are monitored using ever more advanced software.这里的using advanced software现在分层次作状语修饰are monitored，逻辑主语应该是人或者公司吧，因为人才会使用软件去监视。但这个句子的主语是calls and emails，就不一致了吧？还是说...
"Being trusted, being confident, makes you feel better about
yourself and happy," she said. "So are our kids anxious because we
are fearful, we are holding them back, and this is leading them to be
depressed?这句话的so are 是一般疑问句吧，so是修饰anxious吗？so are our kids
anxious...
...不了怎么骑法。误：Once you know to ride a bike you never forget it.正：Once you know how to ride a bike you never forget it.但看到这样一个句子：Does the girl know to ask the police for help?请问这个句子符合英语习惯吗？
It's doubtful ( ) the goverment of that country can accept them as permanent residents答案给的whether，非常不能理解我觉得应该填that啊，请老师对我的错误和答案的理解给出相应的解释。It has puzzled me ( )the old man t...
专家老师好！When
I was a teenager, I felt that I was just young and uncertain - that I was a new
boy in a huge school, and I would have been very pleased to be regarded as
something so interesting as a problem. For one thing, being a problem gives you
a certain identity, and that is one of the...
... 第2段。There is a wall around the city to keep out the hot desert wind and the
streets are narrow ,to provide shade from the sun and allow a breeze to pass
through.后半句话 ",to provide shade from the sun and allow a
breeze to pass through."个人理解是作 the streets are narrow 的目的...
... live. 我总觉得意大利是个居住的好地方。（同上）My wife and I discovered some superb places toeat. 我和妻子发现了一些就餐的极好去处。（《柯林斯高阶英汉双解学习词典》第8版 p.1504）我认为问题中的 A.a good place to live也可以作为正确...
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.
Have you ever thought about having a robot friend? A friend to grow with you and share your joys and sorrows? 老师，这里的to grow是不定式作后置定语吗？还是A friend的同位语呢？烦请老师帮助解答一下！而且这里为啥要用不定式呢，表示目的吗？
an imbalance between ecological wellbeing and natural resources on the one handand economic development on the other这个矛盾是谁和谁的矛盾呀？还有，between后面的名词可以是两个以上吗？
Among the most popular: paternity and kinship testing, which adopted children can use to find their biological relatives and families can use to track down kids put up for adoption.这里的put up for adoption在这里是充当什么成分呢?