在各种……之中

Among various kinds of …
= Of all the … 
例: Among various kinds of sports, I like jogging in particular.  在各种运动中我尤其喜欢慢跑。 
就我的看法……；我认为…… 
In my opinion, … 
= To my mind, …
= As far as I am concerned, … 
= I am of the opinion that … 
例:In my opinion, playing video games not only takes much time but is also harmful to health.  就我的看法打电动玩具既花费时间也有害健康。 

随着人口的增加……    

With the increase/growth of the population, … 随着科技的进步……     
With the advance of science and technology, … 
例:With the rapid development of Taiwan's economy, a lot of social problems have come to pass.  随着台湾经济的快速发展许多社会问题产生了。 

……是必要的 

It is necessary （for sb.） to do / that … 
…… 是重要的 
It is important/essential （for sb.） to do / that … 
…… 是适当的 
It is proper （for sb.） to do / that … 
……是紧急的 
It is urgent （for sb.） to do / that … 
例:It is proper for us to keep the public places clean. 
=It is proper that we （should） keep the public places clean.  我们应当保持公共场所清洁。 

花费  

spend … on sth. / (in) doing sth. … 
例: We shouldn't spend too much time on something we aren't interested in.  我们不应该在我们不感兴趣的事情上花太多的时间。 

how 引导的感叹句 

例:那至少可以证明你很诚实。  
At least it will prove how honest you are. 

状语从句 

A） 如果你不……，你就会……    
If you don't …， you'll … 
例:If you don't keep working hard, you'll lose the chance.如果你不坚持努力工作，你就会失去这次机会。 
B） 如此 ……以至于……  
so … that … 
例:At that moment, I was so upset that I wanted to give up.  当时，我非常伤心，最后都想放弃了。 
C） 每当我听到……我就忍不住感到兴奋  
Whenever I hear …， I cannot but feel excited. 
每当我做……我就忍不住感到悲伤  
Whenever I do …， I cannot but feel sad. 
每当我想到……我就忍不住感到紧张  
Whenever I think of …， I cannot but feel nervous. 
每当我遭遇……我就忍不住感到害怕  
Whenever I meet with …， I cannot but feel frightened. 
每当我看到……我就忍不住感到惊讶  
Whenever I see …， I cannot but feel surprised. 
例:Whenever I think of the clean brook near my home, I cannot but feel sad. 
= Every time I think of the clean brook near my home, I cannot help feeling sad. 
每当我想到我家附近那一条清澈的小溪我就忍不住感到悲伤。 

宾语从句 

我认为……  / 我不认为……  
I think / I don't think that … 
我想知道是否……  
I wonder whether … 
例:He doesn't think I should stop him joining the club.  他认为我不应该阻止他参加这个俱乐部
Since + sb. + 过去式,sb.+ 现在完成式 
例:Since he went to senior high school, he has worked veryhard.  自从他上高中，他就一直很用功。