老师们，请问一下if / when / after这三个词的用法有什么明确的区别吗？比如下面的这些句子：1.We think
young people should look smart and so we would like to wear our own clothes.
Our teachers believe that _________we did that, we would concentrate(集中注意力) more...
新概念2-73：When
he woke up next morning, he
discovered that the boat had, in the meantime, travelled to Calais. No one
noticed the boy as he crept off. 新概念2-75：Early next morning, she
heard planes passing overhead and wondered how she could send a signal. Then
she had an idea.新概念2...
When Anna arrived, we had dinner.与When Anna had arrived,we had dinner.When Mike finished his homework,he took a short rest.与When Mike had finished his homework,he took a short rest.是不是这两种表达都可以表达先后，意思一样?
Therefore
to increase the yield of the targeted products, many
factors are taken into consideration.这个句子是对的吧？这里的to increase的逻辑主语是省略了吗？因为肯定不是many factors。
A joke stored on
a website can be viewed by as many people as _____ want to view it, as many
times as they want to, as quickly as they can request it. A. those B. those who
C. they D. 不填
...asks his mother. “You don't need to have a party this year, Tom. You had one last year, and don't call your friends to come to our home. I think they must be busy,” says his mother.Tom is not happy. Next morning, he goes out of his bed for his breakfast and he sees some balloons are in t...
It is obvious that the way much coffee is grown affects many aspects of life, from the local environment to the global ecology. But consumers do have a choice. They can purchase shade-grown coffee whenever possible, although at a higher cost. The future health of the planet and mankind is surely wor...
①She is as beautiful as youyou后面的are要不要加上呢，连词前后相同成分省略，但是you 和she的be动词的人称不一致，是不是需要加上you后面的are？即She is as
beautiful as you are.②I can carry as many books as you can这句话中you后面的can可以去掉吗...
It was a small love letter Janet had written. The note could look like a school girl’s scrawls about her dream guy. All that was missing was a drawing of a heart with the names John and Janet written in it.
请问这几句该如何翻译，最后一句如何分析？谢谢！
...original photogragh of themselves’ from a lineup including versions that had been altered to appear more and less attractive。1、Rather than放在句首是一个短语？2、beauty compress 怎么理解？
...original photogragh of themselves’ from a lineup including versions that had been altered to appear more and less attractive。1、Rather than放在句首是一个短语？2、beauty compress 怎么理解？
刚刚看到龙楠老师解答某位网友的疑问：http://ask.yygrammar.com/q-6765.html，我感觉 suffer sth 和 suffer from sth的差别好像不太大。请问如何确定是否使用from？例如下面句子，句中的from可以省略吗？Like many cities in the Midwest, St Louis suff...
...射靶子(target)偏离目标更远了，又偏离了一步距离：1. I had one step farther away from the target.2. I had another one step far away from the target.二，我迈向预定目标(target)又近一步了：1. I had one step further toward the target in my mind.2. I had one step closer t...