此句为一般现在进行时态。现在进行时表示此刻正在的动作。中文意思是:我正在踢足球。首先把此句先改为一般疑问句。根据英语语法规定，要把一个句子变为一般疑问句，首先要把句中的be动词/情态动词/助动词提到主语前面构成一般疑问句。此句中刚好有be动词am.所以把am变为are提到句首即为一般疑问句了:Are you playing football.肯定回答是:Yes，I am.
i am playing football 改为一般疑问句肯定回答
Tom is reading books.
一般疑问句：Is Tom reading books?
肯定回Yes， he is.
否定回No， he isn't
I am playing football in the playround.
一般疑问句：Are you playing football on the playground?
肯定回 Yes， I am.
否定回 No， I am not.
The students are cleaning the classroom.
一般疑问句：Are the students cleaning the classroom?
肯定回 Yes， they are.
否定回 No， they aren't
My brother is work in the office now.
一般疑问句：Is your brother working in the office now?
肯定回 Yes， he is.
否定回 No， he isn't.
对于划线（括号）部分提问.
（The baby）is liltening to the music.
Who is listening to the music?
The boys are （playing ping-pong）
What are the boys doing?
They are （reading ）now .
What are they doing now?
I am (singing an Ehglish song).
What are you doing?
They are swimming (in the river).
Where are they swimming?
The girls are (flying kites)
What are the girls doing?
The children are (playing football).
What are the children doing?
I am eating (an apple)
What are you eating?
She is singing (in the classroom)
Where is she singing?
They are singing (happily)
How are they singing
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