I went to Beijing,yesterday.2.I didn't go to Beijing,yesterday.3.Did you go to Beijing,yesterday?＿Yes, I did.4.Whendid you go to Beijing?＿Yesterday.

肯定句：He's climbing a tree.
    疑問句：Is he climbing a tree?
    否定句：He isn't climbing a tree.

一般過去時：
  肯定句：He climbed a tree.
    疑問句：Did he climb a tree?
    否定句：He didn't climb a tree.
將來時：
  肯定句：He's going to climb a tree.
    疑問句：Is he going to climb a tree?
    否定句：He isn't going to climb a tree.
現(xiàn)在完成時：
  肯定句：He's climbed a tree.
    疑問句：Has he climbed a tree?
   否定句：He hasn't climbed a tree.
????????read newspaper??climb moutan???There is a new about Look for dog revelation in a newspaperThere is a search dog in the new newspaper notices