His ball is yellow.（改为复数）
His balls are yellow.
Tt is my yellow sweater .（改为一般疑问句）
Is it your yellow sweater?
They are （their）kites.（对括号提问）
Whose kites are they?
My bike is （under the tree）.（对括号提问）
Where is your bike?
That is （Millie’s skirt）.（对括号提问）
What is that?
Are these your balls?（改成单数形式）
Is this your ball?
Her coat is （purple）.（对括号提问）
Whao color is her coat?
（Sally’s skirt）is in the box?（对括号提问）
What is in the box?
These are blue blouses.（改同义句）
These blouses are blue.
My father’s shoes are there .（改倒装句）
There are my father's shoes.
Whose watch is this?（改同义句）
Whose is this watch?
祝您学习进步,更上一层楼!O(∩_∩)O~