问题描述：
句型转化
1 They do their homework every day.(改为否定句）
2 Jenny is running.(改为否定句）
3 Tom is looking at a picture.（改为一般疑问句,并作肯定回答）
4 The girls are playing over there.(就画线部分提问,画线地方是playing)
5 Jim stands under the tree.(改为现在进行时）
6 He's carrying water for the old woman.(改为一般疑问句）
7 They are cleaning their classroom.(对画线部分提问,画线部分是：their classroom.)
1 They do their homework every day.(改为否定句）
2 Jenny is running.(改为否定句）
3 Tom is looking at a picture.（改为一般疑问句,并作肯定回答）
4 The girls are playing over there.(就画线部分提问,画线地方是playing)
5 Jim stands under the tree.(改为现在进行时）
6 He's carrying water for the old woman.(改为一般疑问句）
7 They are cleaning their classroom.(对画线部分提问,画线部分是：their classroom.)
问题解答：
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