forget to do和forget doing区别和造句：
forget to do sth. 忘记要做某事（未做）
forget doing sth. 忘记曾经做过某事（已做）
I forgot to lock the door.
I forgot locking the door.
She forgot to turn off the light.
She forgot turning off the light.
They forgot to bring the book.
They forgot bring the book.
以上就是forget to do和forget doing区别和造句。同时须搞懂的知识：
remember to do和doing区别