し

Particle: し
Function: Listing multiple reasons
Level: N4
How it works: Attaches to the plain form of verbs, adjectives, or nouns to list multiple reasons or characteristics.
Example: Ame mo furu shi, kaze mo tsuyoi desu. It is raining, and the wind is also strong.
Versus: て (te) connects actions sequentially or lightly, but does not emphasize listing reasons argumentatively like し (shi).