（1）．现在进行时表示现在正在进行或发生的动作，也可表示当前一段时间内的活动或现阶段正在进行的动作。（句中一般含有now, look, listen.）
（2）．现在进行时的肯定句基本结构为be+动词ing.
如：Tom is reading books in his study .
（3）．现在进行时的否定句在be后加not。
如：Tom is reading books in his study .
Tom is not reading books in his study .
（4）．现在进行时的一般疑问句把be动词调到句首。
  如：Tom is reading books in his study .
Is Tom reading books in his study ？
(5)．现在进行时的特殊疑问的基本结构为：疑问词+一般疑问句?
  （注意：当划线部分包含谓语动词时，用疑问词代替划线部分放到句首，原划线处应加上doing）
  如：Tom is reading books in his study .     
Is Tom reading books in his study ?   
What is Tom doing in his study?      
What is Tom reading in the studay?
Where is Tom reading books?
(6) 动词加ing的变化规则
1．一般情况下，直接加ing，如：cook-cooking
2．以不发音的e结尾，去e加ing，如：make-making, taste-tasting
3．如果末尾是辅音字母加一个元音字母和一个辅音字母，双写末尾的辅音字母，再加ing，如：run-running, stop-stopping

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