Si la professora expliqués un altre exemple, entendríem millor la lliçó.

This is the standard Catalan pattern for a hypothetical or unreal situation in the present or future:

• si
  • imperfect subjunctive
• main clause + conditional

So:

• Si la professora expliqués... = if the teacher explained...
• entendríem... = we would understand...

It is very similar to English If the teacher explained another example, we would understand the lesson better.

This structure is used when the speaker is imagining a situation, not stating it as a real fact.

Expliqués is the 1st/3rd person singular imperfect subjunctive of explicar.

Here it agrees with la professora, which is 3rd person singular:

• jo expliqués = if I explained
• ella expliqués = if she explained

In this sentence, it means if the teacher explained.

The imperfect subjunctive is very common after si in hypothetical sentences like this one.

Because the sentence is hypothetical.

• entendríem = we would understand
• entendrem = we will understand

If you say entendrem, the meaning becomes much more real and likely. But with expliqués, the sentence is not presenting the situation as a straightforward future fact; it is presenting it as a hypothetical possibility.

So the matching form is:

• Si ... expliqués, entendríem ...

not

• Si ... expliqués, entendrem ...

Yes, but it means something slightly different.

• Si la professora explica un altre exemple, entendrem millor la lliçó
  = If the teacher explains another example, we will understand the lesson better.

This sounds more real or likely.

• Si la professora expliqués un altre exemple, entendríem millor la lliçó
  = If the teacher explained another example, we would understand the lesson better.

This sounds more hypothetical, more like a suggestion, complaint, or imagined situation.

So both are correct, but they do not express exactly the same thing.

Catalan uses definite articles very naturally before nouns when referring to a specific person or thing.

So la professora means the teacher.

This is completely normal. Catalan often uses the article in places where English does too, and sometimes also where English might omit it in other contexts.

Here, la professora simply refers to a specific female teacher already understood from context.

Yes.

• la professora = the female teacher
• el professor = the male teacher

If the teacher were male, the sentence would be:

• Si el professor expliqués un altre exemple, entendríem millor la lliçó.

So the noun and article both show gender.

In Catalan, altre usually appears with an article or determiner in this kind of sentence.

So:

• un altre exemple = another example

This is the normal way to say another in Catalan.

You will very often see:

• un altre llibre = another book
• una altra idea = another idea
• un altre dia = another day

Notice also the gender/number agreement:

• un altre for masculine singular
• una altra for feminine singular

Since exemple is masculine singular, un altre exemple is correct.

Millor means better.

In this sentence it modifies the verb entendríem:

• entendríem millor la lliçó = we would understand the lesson better

So it is not describing the lesson itself. It is describing the quality of the understanding.

Compare:

• una millor lliçó = a better lesson
• entendre millor la lliçó = to understand the lesson better

Both spellings reflect Catalan pronunciation.

• ll in lliçó
• ç in lliçó

A few useful points:

• ll in Catalan is traditionally a distinct sound, though in many modern accents it is pronounced similarly to y in English yes
• ç represents an s sound before a, o, u

So lliçó is pronounced approximately like lee-SO or lyee-SO, depending on accent.

The written ç is necessary because plain c before o would sound like k, not s.

The accent marks mainly show stress.

• expliqués tells you the stress falls on the final syllable
• entendríem marks the stressed syllable and also helps distinguish the form
• lliçó shows the stress on the final syllable

Accent marks in Catalan are important because they often tell you how to pronounce the word and sometimes help distinguish grammatical forms.

For learners, it is best to treat them as essential spelling, not optional marks.

The given order is the most natural and neutral:

• Si la professora expliqués un altre exemple, entendríem millor la lliçó.

Catalan does allow some variation, especially for emphasis, but this standard order is what learners should use first.

For example, you could emphasize better or the lesson in other contexts, but the basic teaching pattern is:

• Si
  • subject + verb + object, main clause

So this sentence is already in a very normal order.

In standard Catalan, after a simple si in conditional sentences, you normally do not use the conditional.

So standard patterns are:

• Si + present, future/present/imperative
• Si + imperfect subjunctive, conditional
• Si + pluperfect subjunctive, conditional perfect

That is why this sentence has:

• si ... expliqués
• entendríem

and not something like:

• si ... explicaria

That would be nonstandard in careful Catalan.

Yes. It is fully natural and standard.

It could be used in many real situations, for example:

• making a suggestion
• politely criticizing the teaching
• saying what would help the students

It sounds like standard written and spoken Catalan. In very casual speech, people might choose shorter vocabulary, but the grammar here is completely normal and useful to learn.