彼は利口な少年だ。

彼は利口な少年だ。

He is a clever boy.

彼(かれ)は利口(りこう)な少年(しょうねん)だ。

Kare wa rikōna shōnen da.

彼 (かれ)

he; him; his; boyfriend

は (は)

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

利口 (りこう)

clever; intelligent; wise; bright; sharp; sensible; smart; shrewd; well-behaved (of kids, animals, etc); obedient; good; good (with words)

少年 (しょうねん)

boy; juvenile; young boy; youth; lad

だ (だ)

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

Readings: ヒ、かれ、かの、か.の

Meanings: he, that, the

Readings: リ、き.く

Meanings: profit, advantage, benefit

Readings: コウ、ク、くち

Meaning: mouth

Readings: ショウ、すく.ない、すこ.し

Meanings: few, little

Readings: ネン、とし

Meanings: year, counter for years