There are few questions and answer on the choice of gerund versus infinitive. From what I understand, when conveying a purpose the infinitive should be used:
I use my key in order to open the door. [correct]
I use my key in order to opening the door. [incorrect]
I use words to describe my dream. [correct]
I use words to describing my dream. [incorrect]
Yet I read the instruction on an English lesson book:
"Use similes to describing the animals here below."
Could you please confirm what should follow "(in order) to": the gerund or the infinitive?