1.my sister is going to study swimming.(改为一般疑问句)
＿＿＿ ＿＿sister　＿＿＿to study swimming?
2.they are going to take guitar lessons.(改为否定句)
they ＿＿＿ ＿＿＿to take guitar lessons.
3.his cousin is going to be a science teacher.（改为同义句）
his cousin＿＿＿ ＿＿＿ be a science teacher.