来る is an irregular verb so it is strange and doesn't conjugate like you might expect it to
It's casual present negative conjugation is: 来ない/こない
Which when we conjugate it to make it casual past negative is: 来なかった/こなかった
Beneath each verb in the dictionary, it will tell you what type of verb it is, and if you click on it, it will bring up a table of all the different conjugations.
If you look up a word in the dictionary (or see it anywhere else), and it says the verb type just below it, tap on that to get a conjugation table for the verb.
If you look up a word in the dictionary (or see it anywhere else), and it says the verb type just below it, tap on that to get a conjugation table for the verb.
Oh, thank you. It is really helpful. What a big hint. Love it.