I was watching a Japanese TV drama and came across this sentence: そのへんのこと
よ〜く念頭に置いといてね. I think といてね comes from ておいてね. Can anyone please tell me how do
we use this ておいてね and when it is conjugates with 置く how it changes it?
CC BY-SA 3.0
2017-10-01T04:53:04.993
53579
2017-10-02T08:52:48.317
22126
question
grammar conjugations て-form contractions
About ておいてね, what does it mean?
You think right, that といて is a shortened, colloquial version of ておいて. In other
words, ~とく is a casual version of ~ておく where basically て+お is merged into と.

More precisely the shortenings work as follows:

  * ~ておいて / でおいて --> ~といて / どいて 
  * ~ておく / でおく --> ~とく / どく

Note also the negative case:

  * ~ておかないで / でおかないで --> ~とかないで / どかないで

In your example, 置く has nothing special and just follows the above rules.
Hence in a casual setting 置いておいてね becomes 置いといてね.

Briefly, the construction Verb (て-form) + おく is used when you want to prepare
something for future (use) / do something beforehand / go ahead and do
something.

For example:

  * チケット、買っといてね = Buy the ticket (in advance, it will be used later).

Another use is to "do something and leave it for a while / let someone do
something for a while". For example:

  * 彼らには言いたいことを言わせておけばいい = Let them say whatever they want.

Have a look
[here](https://japaneselearningonline.blogspot.jp/2015/11/japanese-grammar-
lesson-te-oku.html) or [here](http://maggiesensei.com/2017/04/06/new-how-to-
use-v%E3%81%A6%E3%81%8A%E3%81%8F-te-oku/) for more info.

Finally, in your case, the meaning is to "put and keep something well in your
mind" (and keep it there for future use. In other words, don't forget!).
CC BY-SA 3.0
2017-10-02T08:52:48.317
53594
2017-10-02T08:52:48.317
14205
53579
answer