"I am going to buy a watch tomorrow."
December 30, 2017
If you want to be more specific with the translation, you can say:
- 我明天會買一個手錶 (Complete)
- 明天我會買一個手錶 (Complete)
Note: Duolingo misses some translations with time and location, so I include extra translations. As long as time is used in setting, you can use it interchangeably in a sentence.