ame ni nureta kutu ha, asa made ni sukkari kawakanakatta.

Because ぬれた is modifying 靴.

In Japanese, a verb in plain form can come directly before a noun and describe it:

• 雨にぬれた靴 = the shoes that got wet in the rain

This works like a relative clause in English, but Japanese does not need a word like that or which.

So instead of saying:

• the shoes that got wet in the rain

Japanese says, more literally:

• rain-by got-wet shoes

雨にぬれた means got wet from the rain or got wet in the rain.

Here, に marks the thing that causes the wetness. With ぬれる meaning to get wet, N にぬれる is a common pattern:

• 雨にぬれる = to get wet in the rain
• 水にぬれる = to get wet with water

So 雨に is not the location here. It is closer to because of / from the rain.

Because ぬれる and ぬらす are different verbs.

• ぬれる = to get wet
  
  • intransitive
• ぬらす = to wet something / to make something wet
  
  • transitive

In this sentence, the shoes themselves became wet, so ぬれた is correct.

• 雨にぬれた靴 = shoes that got wet in the rain

If you used ぬらした, it would suggest that someone wet something else.

Yes, it is the past form of ぬれる, but inside a noun-modifying clause it is best understood as describing a completed event before the main statement.

• 雨にぬれた靴 = the shoes that had gotten wet in the rain

It does not mean the whole sentence is simply past because of this word alone. The main verb of the sentence is 乾かなかった, and that is what controls the main tense of the sentence.

So:

• ぬれた describes the shoes
• 乾かなかった gives the main statement: they did not dry

は marks 靴 as the topic.

• 雨にぬれた靴は = as for the shoes that got wet in the rain...

The sentence is telling us something about those shoes.

Using は often gives a feeling like:

• speaking of those shoes...
• those shoes, as for them...

In English we usually do not translate は directly, but it helps organize the sentence.

Sometimes yes, but it would change the nuance.

• 靴は focuses on the shoes as the topic
• 靴が would focus more on the shoes as the grammatical subject, often with a more neutral or identifying feel

Compare:

• 雨にぬれた靴は、朝までにすっかり乾かなかった。
  = As for the shoes that got wet in the rain, they didn’t dry completely by morning.

• 雨にぬれた靴が、朝までにすっかり乾かなかった。
  = more like The shoes that got wet in the rain were the ones that didn’t dry completely by morning, depending on context

So は is very natural if the speaker is already talking about those shoes.

朝までに means by morning or before morning comes.

The important difference is:

• まで = until
• までに = by, before the deadline of

So:

• 朝まで = until morning
• 朝までに = by morning

In this sentence, the speaker is talking about whether the shoes reached the state of being dry by a certain time, so までに is the natural choice.

• 朝までに乾かなかった = did not dry by morning

No. They have different functions.

1. 雨にぬれた

   • に marks what caused the shoes to get wet

2. 朝までに

   • に is part of までに, which marks a deadline or limit: by morning

So even though both are に, they are not the same kind of に.

すっかり means completely, entirely, or thoroughly.

So:

• すっかり乾く = to dry completely

In this sentence:

• すっかり乾かなかった = did not dry completely

This suggests the shoes may have dried somewhat, but they were not fully dry by morning.

Not necessarily.

Usually, すっかり乾かなかった means they did not become completely dry.

That leaves open the possibility that:

• they dried a little
• they were partly dry
• but they were still not fully dry

If the speaker wanted to strongly say they didn’t dry at all, they would likely say something more explicit, such as:

• 全然乾かなかった = they didn’t dry at all

So すっかり with a negative often means not completely rather than not at all.

It comes from the verb 乾く meaning to dry.

This is the plain negative past form.

Step by step:

• dictionary form: 乾く
• negative stem: 乾か
• add ない: 乾かない = does not dry / did not dry
• past negative: 乾かなかった = did not dry

So:

• 乾く = dry
• 乾かない = not dry
• 乾かなかった = did not dry

Both are possible, but the nuance is slightly different.

• 乾かなかった focuses on the event/result:
  they did not dry
• 乾いていなかった focuses on the state at that time:
  they were not dry

In this sentence, 朝までに sets a deadline, so 乾かなかった fits very naturally because it means the shoes failed to reach the result by morning.

So:

• 朝までにすっかり乾かなかった = they did not become fully dry by morning
• 朝までにすっかり乾いていなかった would sound less natural because までに works especially well with an event or change reaching a point

Yes. Japanese often omits information that is understood from context.

For example, the sentence does not say whose shoes they are:

• my shoes
• your shoes
• the shoes
• his shoes

It simply says:

• 雨にぬれた靴は = as for the shoes that got wet in the rain

English usually requires more explicit wording, but Japanese often leaves this to context.

It breaks down like this:

• 雨にぬれた = got wet in the rain
• 靴 = shoes
• は = topic marker
• 朝までに = by morning
• すっかり = completely
• 乾かなかった = did not dry

So the structure is:

• [The shoes that got wet in the rain] [by morning] [completely] [did not dry].

A natural English order is:

• The shoes that got wet in the rain did not dry completely by morning.

The comma shows a pause:

• 雨にぬれた靴は、朝までにすっかり乾かなかった。

It is not changing the grammar. It just makes the sentence easier to read and reflects a natural pause after the topic.

Japanese commas are often used more freely than English commas, especially after a topic phrase like 靴は.