あの時は本当に楽しかったよ。

あの時は本当に楽しかったよ。

You know, I had a lot of fun.

あの時(とき)は本当(ほんとう)に楽(たの)しかったよ。

Ano toki wa hontōni tanoshikatta yo.

彼の (あの、かの)

that (someone or something distant from both speaker and listener, or situation unfamiliar to both speaker and listener)

時 (とき)

time; hour; moment; occasion; case; chance; opportunity; season; the times; the age; the day; tense

は (は)

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

本当に (ほんとうに、ほんとに、ホントに、ホントーに、ホントウに)

really; truly

楽しい (たのしい)

enjoyable; fun

よ (よ)

indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!

Readings: ジ、とき、 -どき

Meanings: time, hour

Readings: ホン、もと

Meanings: book, present, main, origin, true, real, counter for long cylindrical things

Readings: トウ、あ.たる、あ.たり、あ.てる、あ.て、まさ.に、まさ.にべし

Meanings: hit, right, appropriate, himself

Readings: ガク、ラク、ゴウ、たの.しい、たの.しむ、この.む

Meanings: music, comfort, ease