Αν τύχει να μην έχουμε φρέσκα φρούτα, ανοίγω μια κονσέρβα με ανανά και βάζω μία κουταλιά στο γιαούρτι.

It means something like if it happens that..., if it so happens that..., or more naturally in English, if we happen to...

So:

Αν τύχει να μην έχουμε φρέσκα φρούτα
= If we happen not to have fresh fruit

This is a very common Greek way to express something accidental or occasional, not something planned.

Τύχει is the form used after αν in this kind of sentence. It is the aorist subjunctive form of τυχαίνω.

• τυχαίνει = it happens / it is happening
• τύχει = happen in a dependent clause such as if it happens

So:

• Αν τυχαίνει... would sound wrong here.
• Αν τύχει... is the normal structure.

This is one of those patterns English speakers often just need to get used to: after words like αν, Greek often uses a subjunctive-type form.

Because after να-type constructions and related dependent structures, Greek uses μη(ν) for negation, not δεν.

Here the structure is:

τύχει να μην έχουμε...

So the negative is μην because έχουμε belongs to a clause introduced by να.

A useful rule of thumb:

• δεν = negates ordinary statements
• μη(ν) = negates subjunctive / dependent forms, commands, and similar structures

So:

• Δεν έχουμε φρούτα = We don’t have fruit
• να μην έχουμε φρούτα = not to have fruit

In many Greek verbs, the present subjunctive looks exactly the same as the present indicative. The difference is shown by the particles around it, not by a special ending.

So:

• έχουμε can mean we have
• after να or μην, the same form functions as subjunctive: να έχουμε, να μην έχουμε

That is why έχουμε looks familiar even though the grammar is different.

Because Greek often uses the present tense for habitual or general actions.

The sentence means something like:

If we happen not to have fresh fruit, I open a can of pineapple and put a spoonful in the yogurt.

This is not describing one specific future event. It describes what the speaker usually does in that situation.

So the present tense here has a meaning like:

• that’s what I do
• I normally do this

If the speaker wanted to focus on one future occasion, Greek might use different wording.

Because Greek usually leaves subject pronouns out when the verb ending already makes the subject clear.

• έχουμε = we have
• ανοίγω = I open
• βάζω = I put

So pronouns are unnecessary unless the speaker wants emphasis or contrast.

For example:

• Εγώ ανοίγω... would emphasize I open it
• Εμείς δεν έχουμε... would emphasize we

Without pronouns, the sentence sounds natural and neutral.

That is perfectly natural. The first part talks about the household or group situation:

if we don’t have fresh fruit

Then the speaker says what they personally do in that situation:

I open a can... and I put...

So the shift from we to I is not a grammar problem. It simply reflects the meaning.

Greek commonly uses φρούτα in the plural where English may use either fruit or fruits, depending on style and meaning.

So:

• φρούτα = fruit / fruits
• φρέσκα φρούτα = fresh fruit

Grammatically:

• φρούτα is neuter plural
• φρέσκα is the matching neuter plural form of φρέσκος

So the adjective agrees with the noun.

Literally, κονσέρβα με ανανά means a can/tin with pineapple.

In Greek, με can often describe what something contains, so this is a natural way to say it. In English, we more naturally say:

• a can of pineapple
• a tin of pineapple

So this is a place where Greek and English phrase things differently.

Also, depending on context, Greek speakers might say other things too, such as:

• κονσέρβα ανανά
• κομπόστα ανανά

But κονσέρβα με ανανά is understandable and natural.

The dictionary form is ο ανανάς = pineapple.

In this sentence, it appears as ανανά, which is the accusative singular:

• nominative: ο ανανάς
• accusative: τον ανανά

After με, Greek uses the accusative, so:

• με ανανά = with pineapple

They are basically the same word here: the feminine form of the indefinite article / numeral one.

• μια
• μία

Both are common spellings in Modern Greek.

Very often:

• μια is the more neutral everyday spelling
• μία can make the stress clearer and can sometimes feel slightly more emphatic, especially when the meaning one is important

So in this sentence:

• μια κονσέρβα
• μία κουταλιά

both are fine. The difference is mostly orthographic and stylistic, not a major change in meaning.

It means one spoonful or one spoonful amount.

Literally:

• κουταλιά comes from κουτάλι = spoon
• μία κουταλιά = a spoonful

It does not automatically mean a precise measuring spoon like one tablespoon unless the context makes that clear.

So here it just means a spoonful of pineapple is added to the yogurt.

Στο is the contraction of:

σε + το = στο

So:

• σε το γιαούρτι becomes στο γιαούρτι

This means in the yogurt or into the yogurt, depending on context.

Since γιαούρτι is neuter:

• το γιαούρτι = the yogurt

So:

• βάζω μία κουταλιά στο γιαούρτι
  = I put a spoonful in the yogurt

It means adding a spoonful to the yogurt, not placing the spoon itself there.

Greek often uses βάζω very broadly, just like English put or add in everyday speech.

So here the natural meaning is:

• I add a spoonful to the yogurt

not:

• I place a spoon in the yogurt

The noun κουταλιά makes that clear, because it means spoonful, not spoon.

Yes. That is a very good English equivalent for the tone.

Αν τύχει να μην έχουμε... can be rendered as:

• If we happen not to have...
• Should we happen not to have...
• If it happens that we don’t have...

The Greek sounds natural and slightly idiomatic, and English often needs a similarly flexible translation rather than a word-for-word one.