1 .The girls are singing （对 singing 提问 ）（改一般疑问句）
问题描述：
1 .The girls are singing （对 singing 提问 ）（改一般疑问句）
2.These are Jim's books （对 Jim's 提问 ）（改一般疑问句）
3.There is some milk in the glass （对 some milk 提问 ）（改一般疑问句）
4.There are twelve months in a year
（对 twelve 提问 ）（改一般疑问句）
答
what are the girls doing?
who's books are these?
what is in the glass?
how many month in a year?