Mi madre corta la lechuga y el pepino mientras yo frío las patatas.

Spanish often does drop subject pronouns, so yo is not strictly necessary here.

• Mi madre corta la lechuga y el pepino mientras frío las patatas is grammatically fine.
• In this sentence, yo is included for contrast: my mother is doing one thing, and I am doing another.

So yo adds emphasis and makes the contrast clearer.

In Spanish, the simple present is often used for actions happening right now, especially when the context makes that clear.

So:

• Mi madre corta... = My mother is cutting...
• yo frío... = I am frying...

You could also say:

• Mi madre está cortando la lechuga y el pepino mientras yo estoy friendo las patatas.

That version is also correct, but the original sentence sounds more natural and less heavy in many everyday contexts.

Frío is the first-person singular present form of freír (to fry).

The accent mark shows that the í is stressed and pronounced as a separate syllable:

• frío = FRI-o

Without the accent, Spanish pronunciation rules would suggest a different sound pattern.

This is one of the trickier verb forms because freír is somewhat irregular. In this sentence, yo frío means I fry or I am frying.

Spanish uses the definite article much more often than English does.

In English, we often say:

• cut lettuce
• fry potatoes

But in Spanish, it is very natural to say:

• cortar la lechuga
• freír las patatas

Here, the articles do not necessarily mean the in a strongly specific English sense. They are just the normal Spanish way to talk about the ingredients being prepared.

Mientras means while.

It connects two actions that happen at the same time:

• Mi madre corta la lechuga y el pepino
• mientras yo frío las patatas

So the idea is that both actions are happening simultaneously.

A useful comparison:

• mientras = while
• cuando = when

So mientras is the right choice here because the two actions overlap.

Because one verb can govern two direct objects.

So:

• corta la lechuga y el pepino

means:

• she cuts the lettuce and the cucumber

Spanish does not need to repeat the verb unless you want extra emphasis or a different structure. Repeating it would sound unnecessary here.

Because these are things, not people.

Spanish uses the personal a before a specific human direct object, and sometimes with animals treated as individuals.

For example:

• Veo a mi madre. = I see my mother.

But with things, no a is used:

• Corta la lechuga
• corta el pepino
• frío las patatas

So the sentence is correct without any a.

Both words can mean potatoes, but usage depends on the region.

• In Spain, patatas is the usual word.
• In many parts of Latin America, papas is more common.

Since this sentence is in Spanish from Spain, las patatas is exactly what you would expect.

Yes, mi madre is the normal, neutral way to say my mother.

You could also say mamá if you mean mum / mom, but the tone changes:

• Mi madre corta... sounds neutral and descriptive.
• Mamá corta... sounds more personal and familiar.

Both are correct; it just depends on the tone you want.

It is pronounced in two syllables:

• frí-o

A rough English guide would be FREE-oh, but shorter and crisper.

That is important because the accent mark shows that the vowels are pronounced separately. So it is not one syllable like English frio might be guessed to be.

Yes, absolutely.

That version is fully grammatical:

• Mi madre corta la lechuga y el pepino mientras frío las patatas.

Spanish often omits the subject pronoun because the verb ending already tells you who the subject is:

• frío clearly means I fry / I am frying

The version with yo just adds emphasis or contrast.