Kyo city ni ikimasu. Why there is no wa behind kyo?
Answer is really simple because kyo (today) is not the subject
I go to city today “I” is the subject. Therefore, wa needs to go behind “I”.
The sentence can be written:
Watashi wa kyo city ni ikimasu.
However, in real life conversation, we often omit the subject. Thus “wa” was omitted.