ask for 就是ask sb for sth 向某人要某物,ask for 表示询问,有求于别人,客气的口吻。
ask to ,就是ask sb to do 让某人做某事,ask to 有一种祈使的意思,略带一种命令的口吻。
ask for举例:
Might I ask for a photograph of your little daughter?
我能要一张你小女儿的照片吗?
ask to举例
the teacher ask us to go to school buy school bus.
老师要求我们乘校车去学校。