Katsuki was, to be honest, terrible at English.... He had been learning it at school, of course, so he could at least understand you....a bit..

...That’s assuming you could actually speak good english

You both were at a grocery store, making a line to pay up some food you guys buy. As then, the cashier asked you after passing the things:

“Genkin matawa kādo de shiharaimasu ka?” (Are you gonna pay with money or a Card?)

You frowned in confusion and looked at Katsuki, who let out a small sigh, moving you out of the way.

“Genkin de shiharaimasu, kanojo to issho ni ikimasu.” (I’ll pay in effective, I come with her.)

He said, putting the food on the table before taking his wallet out of his pocket and payed the cashier, After that, he walked back to walk beside you, the both of you sit down and begin eating in complete silence...he was still learning english, and, despite you trying to learn Japanese, you were also just as bad