もし疲れていなければ彼は行っていただろう。

If he hadn't been tired, he would've gone.

もし疲(つか)れていなければ彼(かれ)は行(おこな)っていただろう。

Moshi tsukareteinakereba kare wa okonatteita darou.

若し (もし)

if; in case; supposing

疲れる (つかれる)

to get tired; to tire; to be worn out (e.g. of well used objects); to starve

彼 (かれ)

he; him; his; boyfriend

は (は)

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

行う (おこなう)

to perform; to do; to conduct oneself; to carry out

だ (だ)

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

Readings: ヒ、つか.れる、 -づか.れ、つか.らす

Meanings: exhausted, tire, weary

Readings: ヒ、かれ、かの、か.の

Meanings: he, that, the

Readings: コウ、ギョウ、アン、い.く、ゆ.く、 -ゆ.き、 -ゆき、 -い.き、 -いき、おこな.う、おこ.なう

Meanings: going, journey, carry out, conduct, act, line, row, bank