“See you on Sunday” is the correct way to say it. “See you in Sunday” is not grammatically correct. “See you on Sunday” is a common phrase used to say goodbye and express that you will see someone on the upcoming Sunday. It is a casual way to make plans and let someone know when you will be in touch again.
Which is correct, “in Sunday” or “on Sunday”?
To say that you will see someone on a specific day, you can use the phrase “See you on (day of the week).” For example, “See you on Monday,” “See you on Wednesday,” etc.
The phrase “See You on Sunday” is used to say that you will see someone on the upcoming Sunday. For example, if you are talking to a friend on a Wednesday and want to meet on Sunday, you might say, “See you on Sunday!” to confirm the plans.
On the other hand, “in” is used to refer to a period of time, such as “in the morning,” “in the afternoon,” “in the evening,” or “in the week.” So, “See you in Sunday” doesn’t make sense because Sunday is a specific day, not a period of time.
I hope this helps! Let me know if you have any other questions.