I wrote about my old friend who I took English lessons together in my last entry.

Grammatically, I think this should be "my friend with whom", but nobody speaks like that.

IThat was a story for over 10 years ago.

More natural expression.

He baked some Biscottis for outr teacher and me because he worked at a bakery.

I evenstill sometimes bake Biscottis following the recipe that he taught me back then.

Referring to the Japanese version,

> 今でも、時々ビスコッティを焼きます

The "今でも、時々" part didn't come out in the English. I think starting the sentence with "even today" would actually work, but ending with "back then," knowing that was 10 years ago, feels to me like it makes the sentence sort of "resonate".

I took lessons with him for about a year, but he started skipping lessons frequently andmore and more, eventually didn'not turning up at all.

I felt this was more natural phrasing.

I studied there for three years in total and then quit.

I put the "then" in for slight contrast because "and" alone like this is usually used for natural follow-ups like "I sat at my desk and started to work" and the natural follow-up after "I studied for three years" would be "and got a certificate" or "graduated."

> I got to the office and no one was there. <- kinda weird
> I got to the office but no one was there! <- feels natural to me

"But" might be better than "and" in your sentence, but the "quit" part would also have to change.

One day after, a long time after I quit the school, I happened to bump into the teacher at a convenience store.

We talkedspent some time, catching up each other because it's been a whileup.

"because it *had* been a while" would've been grammatical, but more than that it's not necessary here because of the "a long time after" in the previous sentence.

However, he looked like he hesitate to say, but told me "Actually, the whoone you took lessons with you passed away..." ¶
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I was speechless by the shock.

I wrote about my old friend who took English lessons togetherwith me (?) in my last entry.

Was your friend the teacher or another student? I think the latter, but it wasn't quite clear.

It was a story forom over 10 years ago.

He baked some Biscottis for outr teacher and me because he worked at a bakery.

Ah, now I see that your friend was another student

I even still bake Biscottis to this day following the recipe that he taught me.

your sentence was grammatically correct, I just suggested something a little more natural

He and I took lessons with himtogether for about a year, but he started skipping lessons frequently and eventually didn't turn up at all.

just to make it clear he was another student and not the teacher

I studied there for three years in total and quit.

you can say "in total", but for some reason three years total sounds more natural

One day after a long time II finally quit (theat) school, I bumped into the teacher at a convenience store.

We talkedchatted to catching up eacwith other because it's had been a while.

However, he looked like he hesitate to say, but toldd, before telling me "Actually, the young man who took lessons with you passed away..." ¶
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I was speechless by withe shock.

he who - sounds too formal, it's best to substitute with something along the lines of "the guy who"