Если эти кроссовки мокрые, надень другие.

In Russian, кроссовки is normally a plural noun meaning sneakers / a pair of sneakers.

So:

• эти кроссовки = these sneakers / this pair of sneakers
• мокрые is also plural because it describes кроссовки
• другие is plural for the same reason

Russian often treats clothing items that come in pairs this way. A single shoe can be:

• кроссовка = one sneaker

But when talking about the pair someone would wear, Russian normally uses the plural:

• кроссовки

Because эти is the plural form of this/these.

Here the noun is кроссовки, which is plural, so the demonstrative has to match it:

• этот = this (masculine singular)
• эта = this (feminine singular)
• это = this (neuter singular)
• эти = these (plural)

So:

• эти кроссовки = these sneakers

Russian adjectives and words like this/these must agree with the noun in number and usually also in gender and case.

Because мокрые is the plural adjective form agreeing with кроссовки.

• мокрый = wet (masculine singular)
• мокрая = wet (feminine singular)
• мокрое = wet (neuter singular)
• мокрые = wet (plural)

Since кроссовки is plural, the adjective must also be plural:

• эти кроссовки мокрые = these sneakers are wet

Also, Russian often leaves out the verb to be in the present tense, so there is no word for are here.

Russian normally omits the present-tense verb to be.

So:

• Эти кроссовки мокрые literally looks like These sneakers wet
• but it means These sneakers are wet

This is completely normal in Russian.

Compare:

• Он дома = He is at home
• Книга интересная = The book is interesting
• Кроссовки мокрые = The sneakers are wet

In the past or future, forms of to be do appear:

• Кроссовки были мокрые = The sneakers were wet
• Кроссовки будут мокрые = The sneakers will be wet

Надень is the informal singular imperative of the verb надеть.

That means it is used when speaking to:

• one person
• informally

So надень means:

• put on
• wear
• put on a different pair

Related forms:

• надеть = to put on
• надень = put on! (to one person, informal)
• наденьте = put on! (to more than one person, or to one person formally)

So the full sentence is telling someone:

• If these sneakers are wet, put on different ones.

This is a very common question. In standard Russian, the usual distinction is:

• надеть = to put something on yourself or onto someone

  • надеть куртку
  • надеть кроссовки

• одеть = to dress someone

  • одеть ребёнка = to dress the child

So in this sentence, надень другие is correct because you are putting on sneakers.

A helpful memory trick many learners use:

• надеть что-то
• одеть кого-то

In everyday speech, native speakers sometimes blur this distinction, but for learners, it is best to follow the standard rule above.

Другие is the plural form of other / different, agreeing with the implied noun кроссовки.

Full version:

• надень другие кроссовки = put on other sneakers

But Russian often leaves out a noun when it is obvious from context. So:

• надень другие literally = put on other ones

Why not другой? Because другой is singular. Here we need plural to match кроссовки:

• другой = other/different (singular masculine)
• другая = singular feminine
• другое = singular neuter
• другие = plural

Yes, it is functioning as the direct object, so we do expect the accusative.

The reason it looks like другие is that for plural inanimate nouns/adjectives, the accusative is often the same as the nominative.

Here the implied full phrase is:

• надень другие кроссовки

Since кроссовки are inanimate and plural:

• nominative plural: другие кроссовки
• accusative plural: другие кроссовки

So the form does not change.

That is why другие here is perfectly normal as the object.

Because Russian normally uses a comma to separate a clause introduced by если (if) from the main clause.

So:

• Если эти кроссовки мокрые, надень другие.

This is standard punctuation in Russian.

The sentence has two parts:

1. Если эти кроссовки мокрые = if these sneakers are wet
2. надень другие = put on different ones

Russian punctuation with clause-linking words like если, когда, потому что, and so on is often a bit stricter than English.

Yes. Russian word order is fairly flexible.

For example, you could also say:

• Надень другие, если эти кроссовки мокрые.

This means the same thing: Put on different ones if these sneakers are wet.

The original order sounds very natural because it presents:

1. the condition first
2. then the instruction

That structure is common in both Russian and English.

It is informal, because of надень.

Russian imperatives distinguish between:

• informal singular: надень
• formal singular / plural: наденьте

So:

• Если эти кроссовки мокрые, надень другие.
  = speaking informally to one person

If you wanted to speak politely or to more than one person, you would say:

• Если эти кроссовки мокрые, наденьте другие.

Here it can mean either other or different, depending on the English phrasing.

Natural translations include:

• If these sneakers are wet, put on other ones.
• If these sneakers are wet, put on a different pair.

In context, the idea is simply: don’t wear these wet sneakers; wear another pair instead.

So другие often has a practical meaning like:

• other
• different
• another set / another pair

A rough stress guide:

• Е́сли
• э́ти
• кроссо́вки
• мо́крые
• наде́нь
• други́е

So the sentence is roughly:

• YE-sli EH-ti krass-SOV-ki MO-kry-ye, na-DEN dru-GI-ye

A few helpful notes:

• кроссовки has stress on со́
• надень has stress on the second syllable
• другие has stress on ги́

Yes. Надеть is perfective, and that fits the meaning well.

Perfective verbs in the imperative often mean:

• do this once
• complete this action

So надень means something like:

• put them on
• go ahead and change into them

If you used the imperfective надевай, it could sound more like:

• put it on / be putting it on / do that as a process / as a habitual instruction

In this sentence, the perfective imperative надень is the most natural choice because it is a simple instruction to perform one completed action.