52630
There is a character, an older male, in this manga that I'm reading who uses
this phrase twice  
しないとな and the two lines are like this：  

>   1. お礼をしないとな  
>
>   2. お別れをしないとな  
>
>

The first line, he is referring to himself ( **I** should show my
gratitude)-->I understood it more like "It wouldn't do if I don't show my
gratitude" "I have/must...(among these ideas). It was more clear when the
character said his 2nd line which I interpreted as: Say your goodbyes/Say
farewell (note, he was directing this to another character that was with him).  
I hope I made sense...What exactly is the usage of と here? What does it
express? And does the 1st line sound okay with the interpretations I gave?  
Thank you!
CC BY-SA 4.0
2017-08-23T09:55:28.687
52627
2019-07-20T16:09:43.613
2019-07-20T16:09:43.613
9831
22175
question
translation particle-と
Am I understanding this correctly? しないと
This しないと is a omission of しないといけない. It means "must", "have to".

I think you understand it correctly.
CC BY-SA 3.0
2017-08-23T12:03:21.527
52630
2017-08-23T12:03:21.527
7320
52627
answer