95266
The line comes from a short exchange in a game. The character is surprised
seeing the protagonist walk into a practice room that he's been using, and
later says the following:

> 今日はこれからみっちり、俺様が予約を入れているはずだしよう

which i understand as an assertion that the room is supposed to be booked for
him (for the rest of the day, perhaps? The みっちり is tripping me up a bit), but
what is the meaning of "しよう" here and how does it connect to the rest of the
sentence grammatically? Is it a する conjugation or a totally different word?
CC BY-SA 4.0
2022-07-04T07:52:14.077
95265
2022-07-04T09:40:20.713
51521
question
grammar meaning
What is going on in 〜だしよう
If the character speaks roughly, it is likely to be だ+し+よう, where

  * だ is the auxiliary verb for assertion
  * [し](https://dictionary.goo.ne.jp/word/%E3%81%97/#jn-92431) is a particle indicating reason (def #3)
  * よう is a prolonged version of [よ](https://dictionary.goo.ne.jp/word/%E3%82%88/#jn-226011), ending particle for emphasis.

Your interpretation should be correct.
CC BY-SA 4.0
2022-07-04T09:40:20.713
95266
2022-07-04T09:40:20.713
45489
95265
answer