Шина настільки м’яка, що їхати не можна.

In Ukrainian, the present-tense verb to be is usually omitted in simple sentences like this.

So:

Шина м’яка
literally looks like Tire soft, but it means The tire is soft.

That is completely normal Ukrainian grammar. You would only use a form of бути in other tenses, for example:

Шина була м’яка = The tire was soft

This is a very common pattern meaning so ... that.

In your sentence:

настільки м’яка, що їхати не можна
= so soft that it’s impossible / you can’t drive

So the structure is:

настільки + adjective/adverb + що + result

Examples:

• Він настільки втомлений, що не може працювати. = He is so tired that he can’t work.
• Було настільки холодно, що ми не вийшли. = It was so cold that we didn’t go out.

Because м’яка has to agree with шина.

Шина is:

• feminine
• singular
• nominative

So the adjective must also be feminine singular nominative:

• masculine: м’який
• feminine: м’яка
• neuter: м’яке
• plural: м’які

Since шина is feminine, м’яка is the correct form.

It is in the nominative singular.

Here, шина is the subject of the sentence, so nominative is the expected case:

Шина настільки м’яка...
= The tire is so soft...

The apostrophe shows that the consonant and the following я are pronounced separately, with a y-sound.

So м’яка is pronounced roughly like mya-ka, not like a softened мя as in Russian-style spelling.

In Ukrainian, the apostrophe often appears after б, п, в, м, ф, р before я, ю, є, ї.

Compare:

• м’ята = mint
• м’ясо = meat
• п’ять = five

It is an important spelling feature, not optional punctuation.

Because що introduces a subordinate clause.

The sentence has two parts:

• Шина настільки м’яка
• що їхати не можна

In Ukrainian, subordinate clauses introduced by words like що, коли, якщо, бо are normally separated by a comma.

So the comma here is required.

Yes. In this sentence, що means that, not what.

So:

настільки м’яка, що...
= so soft that...

This is one of the very common uses of що in Ukrainian.

Because їхати usually refers to going by vehicle in one direction, in a specific instance, or setting off now.

їздити usually refers to repeated, habitual, or general travel.

So:

• їхати = to go / to be going / to drive somewhere now
• їздити = to go by vehicle regularly, habitually, back and forth

In this sentence, the idea is roughly:

the tire is so soft that you can’t drive / can’t set off

That fits їхати better.

Because можна / не можна is a common impersonal construction in Ukrainian.

It is followed by an infinitive:

• можна їхати = one may / can go
• не можна їхати = one cannot / must not go

This structure does not need a personal subject like I, you, or we. It often means something general:

• it is possible
• it is allowed
• it is not possible
• it is not allowed

depending on context.

In general, не можна can mean either:

• not allowed
• not possible
• shouldn’t

Here, because the reason is a soft tire, the meaning is more like:

• it’s not possible to drive
• you can’t drive
• you shouldn’t drive

So this is not really about permission. It is about the condition of the tire.

Because Ukrainian often leaves out information that is obvious from context.

If people are already talking about the tire, then їхати не можна is understood as something like:

• you can’t drive with it
• you can’t drive on a tire like that
• it’s not possible to keep driving

A fuller version could be:

• На такій шині їхати не можна. = You can’t drive on a tire like that.
• З такою шиною їхати не можна. = You can’t drive with a tire like that.

So the original sentence is a bit shorter and more context-dependent, but still natural.

Yes, often it can.

These are all possible:

• Шина настільки м’яка, що їхати не можна.
• Шина така м’яка, що їхати не можна.
• Шина так м’яка, що їхати не можна.

All mean roughly The tire is so soft that you can’t drive.

Nuance:

• настільки can sound a bit more formal or emphatic
• така is very common in everyday speech
• так is also common, though with adjectives many learners first notice the такий / така / таке pattern

The given word order is natural and neutral:

Шина настільки м’яка, що їхати не можна.

Ukrainian word order is fairly flexible, but changing it changes emphasis.

For example:

• Настільки м’яка шина, що їхати не можна. — more marked, more literary
• Їхати не можна, шина настільки м’яка. — first emphasizes the result

So the original order is probably the best one for a learner to copy first.

Yes. A few natural alternatives are:

• Шина така м’яка, що їхати не можна.
• На такій шині їхати не можна.
• З такою шиною їхати не можна.

Also, if the intended meaning is specifically that the tire is underinflated or flat, a speaker might choose a more precise adjective such as спущена rather than м’яка.

But grammatically, your original sentence is a good example of:

• omitted is
• adjective agreement
• настільки ... що
• impersonal не можна + infinitive