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 .

　　Tom is reading books in his study .

　　Is Tom reading books in his study ?

　　Is Tom reading books in his study ?

　　What is Tom doing in his study?

　　Where is Tom reading books?

　　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