に
(Ni)
marks target, destination, location of existence, or time.
Connection rules
- +Noun + に
- +For motion destination, に and へ are often interchangeable, though に is more common.
- +For location of action (where the action takes place), use で, not に. に marks where something IS (with ある/いる); で marks where something HAP…
Examples
1.
友だちに手紙を書きます。

Tomodachi ni tegami o kaki masu.
I write a letter to my friend.
「marks target, destination, location of existence, or time」
2.
東京に行きます。

Toukyou ni iki masu.
I go to Tokyo.
「marks target, destination, location of existence, or time」
Practice
There is a phone on the desk.
___電話があります。
Romaji also accepted