When I want to write ‘Today I went to Nagoya.’ Which one is correct?
- 今日は名古屋に行くった。 Or
It can only be 行った. I can't think of any situation where 行くった would be meaningful.
The verb 行く is slightly irregular. Normally, for a verb ending in く you would replace the く with いた to form the past tense. e.g. 書く -> 書いた.