megane o tsukue no ue ni okippanashi ni shite, dekakete shimaimashita.

direct object particle

Breakdown of megane o tsukue no ue ni okippanashi ni shite, dekakete shimaimashita.

• の: possessive case particle
• 〜て: connective form
• しまう: to end up (regretfully)

Questions & Answers about megane o tsukue no ue ni okippanashi ni shite, dekakete shimaimashita.

Why is を used after 眼鏡?

を marks the direct object of the action.

Here, the verb idea is 置く/置きっぱなしにする, so 眼鏡を means the glasses are the thing being left behind.

A literal breakdown is:

• 眼鏡を = the glasses
• 机の上に = on the desk
• 置きっぱなしにして = leaving them there / leaving them as they were placed
• 出かけてしまいました = went out, unfortunately / ended up going out

So 眼鏡 is what was left behind, which is why it takes を.

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Why is it 机の上に and not 机で or 机の上で?

Because 置く takes に for the place where something is put.

• 机の上に置く = to put something on top of the desk
• 机の上で置く would sound unnatural here

A useful contrast:

• に marks the destination or resulting location of placement
  
  • 本を机の上に置く
• で marks the place where an action happens
  
  • 机の上で勉強する

Since the glasses end up on the desk, に is the natural choice.

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What exactly does 置きっぱなし mean?