shuuriuketsukebangou o kakuninshimasu.

I check the repair reference number.

Breakdown of shuuriuketsukebangou o kakuninshimasu.

• を: direct object particle
• 確認かくにんする: to check
• 修理受付番号しゅうりうけつけばんごう: a repair reference number

Questions & Answers about shuuriuketsukebangou o kakuninshimasu.

How do you read this sentence?

A natural reading is:

しゅうり うけつけ ばんごう を かくにんします。
or, without spaces as it would normally be written:
修理受付番号を確認します。

Breakdown:

• 修理 = しゅうり
• 受付 = うけつけ
• 番号 = ばんごう
• を = pronounced o
• 確認します = かくにんします

In normal Japanese writing, you usually would not put spaces between these parts.

What does を do in this sentence?

を marks the direct object of the verb.

Here, the verb is 確認します = to check / confirm, so the thing being checked is:

修理受付番号 = the repair reception number / repair受付 number

So the pattern is:

[thing being checked] + を + 確認します

That is why を is used here.

Why is there no subject like I, we, or you?