Hi, colleagues,                                              I  have read this sentence in ONE of               the famous outside books.                  Keys are not used .......... doors.             (for open_ for opening_to opening  _to open).                                                   My question "is  this question OK?!" 

Original Post

Hi, Wael Shaltoot,

Grammatically speaking, you can use both "to open" and "for opening." Now, the sentence does not make much sense. Keys are used for closing and opening doors.

Perhaps what the author of that sentence meant to say is that keys are not needed when doors are already open: Keys are not used for open doors.

Gustavo, Contributor posted:

Hi, Wael Shaltoot,

Grammatically speaking, you can use both "to open" and "for opening." Now, the sentence does not make much sense. Keys are used for closing and opening doors.

Perhaps what the author of that sentence meant to say is that keys are not needed when doors are already open: Keys are not used for open doors.

Thanks, mentor. Really, I have the same thought. 

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