Se non scongelo il pane in tempo, lo rimetto nel congelatore.

Because this sentence expresses a real or habitual condition: if I don’t thaw the bread in time, I put it back in the freezer.

In Italian, for this kind of real possibility or routine action, the present indicative is very common in both parts:

• Se non scongelo il pane in tempo, lo rimetto nel congelatore.

This is similar to English sentences like:

• If I don’t leave now, I’m late.
• If it rains, I stay home.

Italian does not use a future after se in this kind of sentence.

Because after se meaning if, Italian normally does not use the future tense to express the condition itself.

So Italian prefers:

• Se non scongelo il pane...

not:

• Se non scongelerò il pane...

Even when English might use a future idea, Italian usually keeps the verb after se in the present (or another appropriate non-future form, depending on the sentence type).

A good basic rule is:

• After se = usually no future tense

Lo is a direct object pronoun meaning it.

It refers back to il pane:

• il pane = the bread
• lo rimetto = I put it back

Instead of repeating the noun:

• Se non scongelo il pane in tempo, rimetto il pane nel congelatore.

Italian usually replaces the repeated noun with a pronoun:

• Se non scongelo il pane in tempo, lo rimetto nel congelatore.

Since pane is masculine singular, the pronoun is lo.

In Italian, object pronouns like lo, la, li, le usually come before a conjugated verb.

So:

• lo rimetto = I put it back
• la vedo = I see her/it
• li compro = I buy them

This is different from English, where the object normally comes after the verb:

• I put it back

So lo rimetto is the normal Italian word order.

Rimettere means to put back, to put again, or to return something to a place.

That fits the sentence well, because the bread was already in the freezer before, so now you are putting it back:

• mettere = to put
• rimettere = to put back

So:

• lo metto nel congelatore = I put it in the freezer
• lo rimetto nel congelatore = I put it back in the freezer

The prefix ri- often gives the idea of again/back.

Because in + il contracts to nel.

This is very common in Italian with prepositions plus articles:

• in + il = nel
• in + lo = nello
• in + la = nella
• in + i = nei
• in + gli = negli
• in + le = nelle

So:

• nel congelatore = in the freezer

You should think of nel as a single normal form, not as something unusual.

Congelatore means freezer.

Frigorifero means refrigerator / fridge.

So in this sentence:

• nel congelatore = into the freezer

That makes sense because the bread is being thawed and then possibly put back into the freezer.

In tempo means in time, soon enough, or before it’s too late.

So:

• Se non scongelo il pane in tempo... = If I don’t thaw the bread in time...

It refers to doing something within the necessary amount of time.

You’ll also see it in other common expressions:

• Arrivare in tempo = to arrive in time
• Finire in tempo = to finish in time

Yes. Congelare means to freeze, and scongelare means to defrost / thaw.

The prefix s- here gives the idea of reversing the action:

• congelare = freeze
• scongelare = unfreeze / thaw

So:

• scongelo il pane = I thaw the bread

This is a very useful everyday verb, especially for food.

Yes, il pane here refers to a specific thing in context: the bread you are talking about.

Italian often uses the definite article in places where English might or might not use one, but in this sentence it is very natural:

• scongelo il pane = I thaw the bread

If you said just scongelo pane, that would sound wrong in standard Italian.

Yes. With the present tense, the sentence can sound like:

• a habit
• a general rule
• something that happens in a real situation

So it can mean something like:

• If I don’t thaw the bread in time, I put it back in the freezer.

That sounds like a usual practice.

If you wanted to make it clearly about a future situation, Italian might still use the present:

• Se non scongelo il pane in tempo, lo rimetto nel congelatore.

Italian often uses the present where English might think more in terms of future meaning.

No. With a normal conjugated verb, that is not correct.

You must say:

• lo rimetto

not:

• rimetto lo

Italian object pronouns go before the conjugated verb:

• lo mangio
• la compro
• li vedo

They attach after the verb only in certain forms, such as infinitives, imperatives, and gerunds:

• rimetterlo = to put it back
• rimettilo = put it back
• rimettendolo = putting it back

But in your sentence, lo rimetto is the correct form.