Explanation
Asking someone to pretend or accept that something has already happened or taken a certain state.
Formation
Verb (past, casual) + ことにしてください
Detailed explanation
The grammar point 'Verb たことにしてください' is used to request someone to act as if or pretend that a certain action has already occurred or a certain state exists. It is used in various contexts to express the idea of accepting a hypothetical situation for convenience or to avoid conflicts.
Examples
Kinou no koto wa wasureta koto ni shite kudasai.
Please act as if you have forgotten about yesterday.
Watashi ga koko ni kita koto o dare ni mo iwanaide, himitsu ni shita koto ni shite kudasai.
Please don't tell anyone that I came here; act as if it’s a secret.
Kare ga machigaeta to omotta koto ni shite kudasai.
Please pretend that you think he made a mistake.
Kanojo ga kaetta koto ni shite kudasai.
Let’s pretend that she has gone home.
Practice
Grammar content sourced from hanabira.org.