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LetsLet's say my friend asks me to buy something form the grocery store but I forget about it.

Friend: Did you get that thing?

Me  : Oh, so sorry, Itit completely slipped out of my mind.

Is the expression correct? orOr should I use something else in it'sits place?  

Lets say my friend asks me to buy something form the grocery store but I forget about it.

Friend: Did you get that thing?

Me  : Oh so sorry, It completely slipped out of my mind.

Is the expression correct? or should I use something else in it's place?  

Let's say my friend asks me to buy something form the grocery store but I forget about it.

Friend: Did you get that thing?

Me: Oh, so sorry, it completely slipped out of my mind.

Is the expression correct? Or should I use something else in its place?

1
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Is 'slip out of my mind' correct in this context?

Lets say my friend asks me to buy something form the grocery store but I forget about it.

Friend: Did you get that thing?

Me : Oh so sorry, It completely slipped out of my mind.

Is the expression correct? or should I use something else in it's place?