jugyou no ato, toshokan ni yotte fukushuushimasu.

After class, I stop by the library and review.

Breakdown of jugyou no ato, toshokan ni yotte fukushuushimasu.

• に: destination particle
• の: possessive case particle
• あと: after
• 図書館としょかん: library

Questions & Answers about jugyou no ato, toshokan ni yotte fukushuushimasu.

Why is の used in 授業のあと?

Because あと is a noun. It means after or the time after.

In Japanese, one noun often connects to another with の, so 授業のあと is literally something like the after of class, which naturally becomes after class in English.

You can see the same pattern in:

• 食事のあと = after the meal
• 仕事のあと = after work

So の is not showing possession here. It is linking two nouns.

Why is に used after 図書館?

Here, に goes with 寄る.

With 寄る, the particle に marks the place you stop by:

• コンビニに寄る = stop by the convenience store
• 駅に寄る = stop by the station

So 図書館に寄って means stopping by the library.

A very common point of confusion is に versus で:

• 図書館に寄る = stop by the library
• 図書館で復習する = review at the library

In this sentence, に belongs to 寄って, not to 復習します.

What nuance does 寄る have here?