Я слышу шаги в коридоре.

Yes. Слышу already tells you the subject is I, because it is the 1st person singular form of слышать.

So Russian can say either:

• Слышу шаги в коридоре.
• Я слышу шаги в коридоре.

Including я is normal and often sounds a little more explicit or neutral. Leaving it out is also natural, especially when the subject is already clear from context.

Russian distinguishes between hearing and listening:

• слышать / слышу = to hear
• слушать / слушаю = to listen

So:

• Я слышу шаги = I hear footsteps
• Я слушаю музыку = I am listening to music

In this sentence, the person is perceiving a sound, not actively trying to listen, so слышу is the correct verb.

Слышу is the 1st person singular present tense form of слышать.

Basic forms:

• я слышу = I hear
• ты слышишь = you hear
• он / она слышит = he / she hears
• мы слышим = we hear
• вы слышите = you hear
• они слышат = they hear

So the ending -у here corresponds to I.

Шаги is the plural form of шаг (step).

In English, footsteps is also usually plural, and Russian commonly uses the plural here too, because you normally hear more than one step:

• шаг = a step
• шаги = steps / footsteps

So Я слышу шаги means I hear footsteps.

Here шаги is in the accusative plural, because it is the direct object of слышу.

However, for inanimate plural nouns, the accusative plural is usually the same as the nominative plural. That is why it looks like шаги.

Compare:

• nominative plural: шаги
• accusative plural: шаги

So although the form looks the same, its role in the sentence is that of a direct object.

Because this sentence describes location, not movement.

After в:

• в + accusative usually means into / motion toward somewhere
• в + prepositional usually means in / location

So:

• в коридор = into the corridor
• в коридоре = in the corridor

Here the footsteps are in the corridor, so Russian uses в коридоре.

Коридоре is the prepositional singular of коридор.

The noun changes like this:

• nominative: коридор
• prepositional: в коридоре

This is a very common pattern for masculine nouns after в when talking about location.

Yes. Russian word order is flexible, because case endings show the grammatical roles.

Possible versions include:

• Я слышу шаги в коридоре.
• В коридоре я слышу шаги.
• Шаги я слышу в коридоре.

These all express roughly the same basic idea, but the focus changes:

• Я слышу шаги в коридоре = neutral
• В коридоре я слышу шаги = emphasizes in the corridor
• Шаги я слышу в коридоре = emphasizes footsteps

The most neutral version is the original one.

Yes, very naturally:

• Слышу шаги в коридоре.

This can sound a bit immediate, like someone reacting in the moment: I hear footsteps in the corridor.

Russian often omits subject pronouns when the verb form already makes the subject clear.

Yes, but it would change the meaning.

• Я слышу шаги в коридоре. = I hear footsteps in the corridor.
  Ongoing, present perception.
• Я услышал шаги в коридоре. = I heard footsteps in the corridor. / I caught the sound of footsteps in the corridor.
  A completed event: the sound was noticed at a particular moment.

So слышу is imperfective and present, while услышал is perfective and usually refers to a completed act of hearing.

The main stresses are:

• Я слЫшу шагИ в коридОре.

Stress by word:

• я
• слЫшу
• шагИ
• в
• коридОре

A rough pronunciation guide:

• я ≈ ya
• слышу ≈ SLY-shu
• шаги ≈ sha-GEE
• в коридоре ≈ f ka-ri-DO-re or v ka-ri-DO-re, depending on connected speech

In normal speech, в is often pronounced close to f before the voiceless к in коридоре.

Шаги is very natural and common. It literally means steps, but in context it works like footsteps.

Russian can also use more specific words in some contexts, but шаги is the most straightforward everyday choice here.

For example:

• Я слышу шаги. = I hear footsteps.
• Слышны шаги. = Footsteps can be heard. / You can hear footsteps.

So for a basic sentence like this, шаги is exactly what a learner should expect.