hoshoukikan o kakuninshita okage de, shuuri ga hoshoutaishou da to wakarimashita.

direct object particle

Breakdown of hoshoukikan o kakuninshita okage de, shuuri ga hoshoutaishou da to wakarimashita.

• が: subject particle
• と: quotative particle
• だ: to be

Questions & Answers about hoshoukikan o kakuninshita okage de, shuuri ga hoshoutaishou da to wakarimashita.

What is the overall structure of this sentence?

A natural breakdown is:

• 保証期間を確認した = checked the warranty period
• おかげで = thanks to that / because of that
• 修理が保証対象だ = the repair is covered by the warranty
• と分かりました = I found out / I learned that

So the whole sentence means something like:

Thanks to checking the warranty period, I found out that the repair is covered by the warranty.

A more literal version would be:

Because I checked the warranty period, I understood that the repair is a warranty-covered item.

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What does おかげで mean here?

おかげで means thanks to ..., because of ..., or owing to ..., and it usually has a positive or favorable nuance.

So:

• 保証期間を確認したおかげで = thanks to checking the warranty period

This suggests that checking the warranty period led to a useful or good result.

Compare:

• おかげで = thanks to, with a positive feeling
• せいで = because of, often with a negative result

So if the outcome were bad, せいで might be used instead.

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Why is it 確認した and not 確認する?