君が必要だ。

君が必要だ。

I need you.

君(きみ)が必要(ひつよう)だ。

Kimi ga hitsuyō da.

君 (きみ)

you; buddy; pal; monarch; ruler; sovereign; (one's) master

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

必要 (ひつよう)

necessary; needed; essential; indispensable; necessity; need; requirement

だ (だ)

be; is; indicates past or completed action; indicates light imperative

Readings: クン、きみ、 -ぎみ

Meanings: mister, you, ruler, male name suffix

Readings: ヒツ、かなら.ず

Meanings: invariably, certain, inevitable

Readings: ヨウ、い.る、かなめ

Meanings: need, main point, essence, pivot, key to