分词 find, think,can等的使用方法

   Being in unfamiliar city can be frightening .And find an address can be like looking for a needle in a haystack.
  Don't be angry .Just ask someone for directions.However,city people usually give the directions very quickly.You may find it difficult to follow what they're saying.
 
   Therefore,you 'd better draw the route on a map as you're listening to the directions.
一、分词作形容词用
Being in unfamiliar city can be frightening frightening意为“令人感到害怕的”
1、 现在分词：令人……的；正在……的（即将……的）
    The news is encouraging.
   这消息令人振奋。
  The retiring teacher made a farewell speech.
  这位即将退休的老师做了一次告别演说。
过去分词：感到……的；已经……的
  I was encouraged when i heard the news .
  我听到这消息时感到很振奋。
 The retired teacher was invited to give a speech yesterday.
  这位退休的老师昨天应邀发表演说。
2、can、 could
 a.能够=be able to
  He can(is able to) cope with the problem.
  他能够处理这个问题。
  cope with =deal with 应付 处理
  deal in 从事……买卖
  what do you do for living?
 I deal in cars.
b. 有可能
  He can be wrong to say so .
 他要是这么说可能错了。
c.可以 =may
  You can go home now.
  你现在可以回家了。
d.在疑问句和否定句中 表示“有可能”或“不可能”的意思
  Can it be true ?No ,it can't be true.
e.对过去事物的否定推论 can't have +过去分词 不可能曾……
 He is honest that he can't have stolen your money yesterday.
 他这么老实不可能昨天偷你的钱。
*仅用于否定推论，无法做肯定推论。
肯定推论用： must have +过分去词 一定曾经……
                    may have +过去分词 可能曾经……
疑问句中：Can sb have +过去分词 ？ 有可能……吗？
f.could为can的过去式，通常与另一一般过去时连用表示过去的状况。
She can speak English well when she was young.
她10岁时英语就说得很好了。
g.表示客气的语气
Could you please open the window?
可以请你打开窗户吗？
h.=was /were able to 表示过去的能力
When young ,he could eat eight bowls of rice at a time.
他年轻时可以一次吃8碗饭。
I.can 与not连用时，应该写成cannot或can't.
J. I can but(only) do so. 我只能这么做。
 I cannot but laugh=I cannot help but laugh=I cannot help laughing.
我忍不住大笑。
We cannot be too careful in chooseing friends.
我们在择友时再小心也不为过。
I couldn't care less.
我一点也不在乎。
I couldn't agree more.
我同意极了。