Якщо миша не працює, я користуюся тільки клавіатурою.

Якщо means if. It introduces a condition:

• Якщо миша не працює = If the mouse doesn’t work

So the whole sentence has this structure:

• If X happens, I do Y.

In Ukrainian, just like in English, a conditional clause like this is very common.

Because Якщо миша не працює is a subordinate clause, and Ukrainian normally separates it from the main clause with a comma.

So:

• Якщо миша не працює, = conditional clause
• я користуюся тільки клавіатурою. = main clause

This is standard punctuation in Ukrainian.

Миша is in the nominative singular because it is the subject of працює:

• миша = the mouse
• працює = works / is working

So literally:

• mouse not works → the mouse doesn’t work

Yes. Миша can mean both the animal and the computer device. Context tells you which one is meant.

In this sentence, because of клавіатурою (keyboard), it clearly means computer mouse.

In Ukrainian, не is usually written separately from verbs:

• не працює = doesn’t work
• не знаю = don’t know
• не хочу = don’t want

So не працює is the normal way to say is not working / doesn’t work.

Ukrainian often uses the present tense here where English might use either:

• If the mouse doesn’t work
• If the mouse isn’t working

So не працює can cover both a general and a current meaning depending on context.

In this sentence, it sounds natural as a general or repeated situation:

• If the mouse doesn’t work, I use only the keyboard.

The verb користуватися means to use in the sense of make use of something.

So:

• я користуюся = I use / I make use of

This is a very common Ukrainian verb for using tools, devices, services, etc.

A learner may also see використовувати, which also means to use, but користуватися is extremely natural for things like:

• користуватися комп’ютером = to use a computer
• користуватися словником = to use a dictionary

-ся is a reflexive marker that appears in many Ukrainian verbs. In користуватися, it is just part of the verb you need to learn.

So the dictionary form is:

• користуватися = to use

And the first-person singular form is:

• я користуюся = I use

You should learn this verb together with -ся, because користувати by itself is not the normal verb here.

Because користуватися requires the instrumental case.

So:

• dictionary form: клавіатура = keyboard
• instrumental singular: клавіатурою = with a keyboard / by means of the keyboard

After користуватися, the thing being used goes in the instrumental:

• користуватися клавіатурою
• користуватися телефоном
• користуватися словником

This is one of the most important grammar points in the sentence.

Клавіатура is a feminine noun ending in -а. In the instrumental singular, that ending changes to -ою:

• клавіатура → клавіатурою

This is a very common pattern for feminine nouns:

• книга → книгою
• ручка → ручкою
• машина → машиною

So here:

• користуюся клавіатурою = I use the keyboard

Тільки means only.

In this sentence:

• я користуюся тільки клавіатурою = I use only the keyboard

Placing тільки before клавіатурою emphasizes that the keyboard is the only thing being used.

Compare:

• я тільки користуюся клавіатурою could suggest something more like I only use the keyboard with slightly different focus
• я користуюся тільки клавіатурою clearly focuses on keyboard as the only tool

Yes, often it can be omitted, because the verb form already shows the person:

• користуюся already means I use

So Ukrainian speakers could say:

• Якщо миша не працює, користуюся тільки клавіатурою.

That is still grammatical and natural in many contexts.

Including я can add clarity, emphasis, or simply sound more explicit.

The sentence is natural as written, but Ukrainian word order is fairly flexible.

For example, these are also possible:

• Якщо миша не працює, я тільки клавіатурою користуюся.
• Я користуюся тільки клавіатурою, якщо миша не працює.

However, the original version is the most neutral and straightforward.

Word order changes usually affect emphasis, not the basic meaning.

Sometimes, but not always.

• Якщо = if
• Коли = when

If you mean a real condition, Якщо is the better choice:

• Якщо миша не працює... = If the mouse doesn’t work...

If you mean something more like a repeated situation that regularly happens, коли can sometimes work:

• Коли миша не працює, я користуюся тільки клавіатурою.
• When the mouse doesn’t work, I use only the keyboard.

But якщо is the safest and most direct equivalent of if.

Most naturally, it sounds habitual or general:

• If the mouse doesn’t work, I use only the keyboard.

The present tense in both parts often gives that general meaning in Ukrainian.

But depending on context, it could also describe a current situation. Ukrainian leaves that kind of nuance to context more often than English does.