kare no kurou o rikaishita.

I understood his hardship.

Breakdown of kare no kurou o rikaishita.

• を: direct object particle
• の: possessive case particle
• 彼かれ: he
• 理解りかいする: to understand

Questions & Answers about kare no kurou o rikaishita.

What does の do in 彼の苦労?

の links two nouns and shows a relationship between them. Here, it works like his in English.

• 彼 = he / him / boyfriend depending on context
• 彼の = his
• 苦労 = hardships / struggles / difficulties

So 彼の苦労 means his hardships or the struggles he went through.

Why is を used after 苦労?

を marks the direct object of the verb, meaning the thing being understood.

In this sentence:

• 彼の苦労 = what is being understood
• 理解した = understood

So 彼の苦労を理解した literally means understood his hardships.

What tense is 理解した?

理解した is the plain past form of 理解する, which means to understand.

• 理解する = understand
• 理解した = understood

So the sentence is in the past tense: someone understood his hardships.

Depending on context, English might also translate it as came to understand.