君は問題児ですね。

君は問題児ですね。

You are a troublemaker.

君(きみ)は問題児(もんだいじ)ですね。

Kimi wa mondaiji desu ne.

君 (きみ)

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

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

問題児 (もんだいじ)

problem child

です (です)

be; is

ね (ね、ねえ)

indicates emphasis, agreement, request for confirmation, etc.; is it so; hey; come on; listen; not

Readings: クン、きみ、 -ぎみ

Meanings: mister, you, ruler, male name suffix

Readings: モン、と.う、と.い、とん

Meanings: question, ask, problem

Reading: ダイ

Meanings: topic, subject

Readings: ジ、ニ、ゲイ、こ、 -こ、 -っこ

Meanings: newborn babe, child, young of animals