如：Tom is reading books in his study .

　　3．現在進行時的否定句在be后加not。

　　如：Tom is reading books in his study .

　　Tom is not reading books in his study .

　　4．現在進行時的一般疑問句把be動詞調到句首。

　　如：Tom is reading books in his study .

　　Is Tom reading books in his study ？

　　5．現在進行時的特殊疑問的基本結構為：疑問詞+一般疑問句?

　　（注意：當劃線部分包含謂語動詞時，用疑問詞代替劃線部分放到句首，原劃線處應加上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?

　　動詞加ing的變化規則

　　1．一般情況下，直接加ing，如：cook-cooking

　　2．以不發音的e結尾，去e加ing，如：make-making, taste-tasting

　　3．如果末尾是輔音字母加一個元音字母和一個輔音字母，雙寫末尾的輔音字母，再加ing，如：run-running, stop-stopping