JLPT N4. Used in both conversation and writing, although it is a casual expression.

し is used to list clauses. It can be used with verbs, adjectives, and nouns, but with na-adjectives and nouns the auxiliary verb is required.

The difference between ~し and ~たり is that ~し is used to list related things. For example, if someone asked you why you liked Wada-sensei you might reply:

Wada-sensei is clever, amusing and, moreover, he’s kind.

All the above are related—they are reasons why you like Wada-sensei. One typical sentence structure is to list two reasons and then give the result at the end.

That restaurant is cheap and the food is good—I like it.
There’s not much overtime, you can easily take holiday—that company is popular among new graduates.

し is often used at the end of the sentence to give a belated or secondary reason for something.

和田わだ 明日あしたはピックニックにくの?
Wada You going to the picnic tomorrow?
ロス そうだよ。ほかにやることない
Ross Yeah. Besides, I don’t have anything else to do.
はな 夏休なつやすみはバイトをしようとおもっているんだけど、どうおもう?
Hana I was thinking about getting a job during the summer holidays. What do you think?
大地だいち いえでぶらぶらすごごすよりいいんじゃない?おかねすこめられる
Daichi It’s better than hanging around the house all day? You can also save some money.
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