Jeśli jutro będzie zasięg, oddzwonię do teściowej i zarezerwuję stolik w kawiarni, gdzie podają dobre gofry.

Jeśli means if. It introduces a condition:

• Jeśli jutro będzie zasięg... = If there is signal/reception tomorrow...

You may also see jeżeli, which means the same thing and is slightly more formal or careful in tone. In everyday speech, jeśli is very common.

Because Polish normally uses the future tense when talking about a real future situation.

• jutro będzie zasięg = there will be signal tomorrow

English often uses the present after if:

• If there is signal tomorrow, I'll call back

But Polish does not copy that pattern here. It uses the future:

• Jeśli jutro będzie zasięg, oddzwonię...

So this is a very common difference between English and Polish.

Here zasięg means phone signal, cell coverage, or reception.

So:

• będzie zasięg = there will be signal / there will be reception

In modern everyday Polish, this usually refers to mobile phone coverage. A learner may first know zasięg as range or reach, but in this context it clearly means network signal.

Oddzwonię means I’ll call back.

It comes from oddzwonić, which specifically means returning someone’s call. Compare:

• zadzwonię = I’ll call
• oddzwonię = I’ll call back

So if someone called earlier, oddzwonić is the natural verb.

This is a very useful distinction in Polish, because prefixes often change the meaning quite precisely.

Because oddzwonić normally goes with do + Genitive, just like dzwonić do kogoś = to call someone.

So:

• oddzwonię do teściowej = I’ll call my mother-in-law back

The noun teściowa changes to the Genitive singular after do:

• teściowa → do teściowej

This is one of those verb patterns you mostly have to learn as a unit:

• dzwonić do kogoś
• zadzwonić do kogoś
• oddzwonić do kogoś

It means mother-in-law.

The base form is:

• teściowa = mother-in-law

For comparison:

• teść = father-in-law

In the sentence, teściowej is just the case form required after do.

Because they are perfective verbs, and in Polish the present-tense forms of perfective verbs usually refer to the future.

So:

• oddzwonię = I will call back
• zarezerwuję = I will reserve / book

This is a very important Polish pattern:

• imperfective present = true present, ongoing/habitual
• perfective present form = future meaning

For example:

• rezerwuję = I am reserving / I reserve
• zarezerwuję = I will reserve

Because zarezerwować is perfective and focuses on the completed result: the reservation will get made.

• zarezerwuję stolik = I’ll reserve a table

If you said będę rezerwować, that would sound more like emphasizing the process:

• I’ll be making a reservation / I’ll be in the process of reserving

In this sentence, the important thing is the completed action, so zarezerwuję is the natural choice.

In restaurant and café contexts, stolik is the normal word for table in the sense of a place for customers to sit.

• zarezerwować stolik = to reserve a table

Stół is a more general table, often just the piece of furniture.
Stolik can literally mean small table, but in places like cafés and restaurants it is very idiomatic and standard.

So this is not necessarily about size; it is about natural usage.

Because w meaning in takes the Locative case when talking about location.

The base form is:

• kawiarnia = café

After w for location:

• w kawiarni = in the café

So this is a normal case change:

• kawiarnia → w kawiarni

Because gdzie is a very natural way to mean where after a place noun.

• kawiarnia, gdzie podają dobre gofry = a café where they serve good waffles

You can also say:

• kawiarnia, w której podają dobre gofry

That is also correct, and a bit more explicitly structured. But gdzie is very common and natural in everyday Polish.

In Polish, a 3rd person plural verb is often used with a general, indefinite meaning like English they, people, or sometimes a passive-like idea.

So:

• gdzie podają dobre gofry

means something like:

• where they serve good waffles
• where good waffles are served
• where you can get good waffles

There is no need to name the subject. It just means the café serves them.

Dobre gofry is the direct object of podają.

• podają co? = what do they serve?
• dobre gofry = good waffles

So this is the Accusative plural.

With masculine inanimate plural nouns like gofry, the accusative plural looks the same as the nominative plural:

• gofry = nominative plural
• gofry = accusative plural

And the adjective matches:

• dobre gofry

Yes, Polish word order is fairly flexible, but the original order sounds natural and neutral.

• Jeśli jutro będzie zasięg, oddzwonię do teściowej i zarezerwuję stolik w kawiarni, gdzie podają dobre gofry.

This flows well because it goes:

1. condition
2. first action
3. second action
4. more detail about the café

You could move things around for emphasis, for example:

• Jeśli jutro będzie zasięg, zarezerwuję stolik w kawiarni i oddzwonię do teściowej.

That is still grammatical, but it changes the emphasis and natural flow a bit. Polish allows this more than English, but not every possible order sounds equally natural.

Yes — it is a very good sentence for showing how Polish aspect works.

The two main planned actions are perfective:

• oddzwonię = I will call back
• zarezerwuję = I will reserve

These point to single, completed future actions.

But in the relative clause, podają is imperfective:

• gdzie podają dobre gofry = where they serve good waffles

That is because this is not about one completed serving event. It describes a general, repeated characteristic of the café. So imperfective is exactly what Polish wants there.