La meva opinió és que el diari explica molt bé la notícia.

In Catalan, possessives are usually used together with a definite article. So la meva opinió literally looks like the my opinion, but it simply means my opinion.

This is very common:

• el meu llibre = my book
• la teva casa = your house
• les seves idees = his/her/their ideas

English normally does not use the before possessives, but Catalan usually does.

Meva is the feminine singular form of my because opinió is a feminine singular noun.

The possessive must agree with the noun, not with the speaker:

• el meu cotxe = my car
• la meva opinió = my opinion
• els meus amics = my friends
• les meves idees = my ideas

So meva is chosen because opinió is feminine singular.

The accent mark shows where the stress falls: opi-ni-Ó.

Catalan uses written accents more consistently than English to show pronunciation and sometimes vowel quality. In opinió, the accent tells you the final syllable is stressed.

This is important because stress can change from word to word, and Catalan spelling often marks it clearly.

Here, és que introduces a clause: the opinion is that...

So:

• La meva opinió és que... = My opinion is that...

In this sentence, és is simply the verb to be in the 3rd person singular: is.

It is similar in form to Spanish es que, but here it is not an idiomatic excuse-making expression like Spanish sometimes uses. It is just a straightforward structure:

• X és que Y = X is that Y

In this sentence, diari is a noun meaning newspaper.

So:

• el diari = the newspaper

Yes, related forms can refer to something daily in other contexts, but here the article el and the sentence meaning make it clear that it is the noun newspaper.

Explica is the present tense verb form meaning explains.

The subject is el diari = the newspaper, which is third person singular, so the verb is:

• explico = I explain
• expliques = you explain
• explica = he/she/it explains

So el diari explica... means the newspaper explains...

The other forms you mentioned are different:

• explicant = explaining
• explicació = explanation

Yes, explicar basically means to explain or to tell. But with things like news, stories, or events, Catalan often uses explicar where English might prefer report, tell, or cover.

So el diari explica molt bé la notícia is literally the newspaper explains the news very well, but in natural English it could also be understood as:

• The newspaper reports the story very well
• The newspaper covers the news very well

This is a normal vocabulary difference between the languages.

Molt bé means very well.

Here:

• molt = very / much
• bé = well

Since the verb is explica, we need an adverbial idea: explains well. Then molt intensifies bé:

• bé = well
• molt bé = very well

You would not normally use molt alone here to mean very well. Molt needs something to modify.

This is a very common learner question.

• bé = well, as an adverb
• bo / bona / bons / bones = good, as an adjective

In this sentence, bé is correct because it modifies the verb explica:

• explica bé = explains well

If you were describing a noun, you would use bo/bona:

• una bona notícia = a good piece of news
• un bon diari = a good newspaper

So:

• verbs usually take bé
• nouns usually take bo/bona, etc.

La notícia is singular and literally means the news item, the story, or the piece of news.

This can be tricky for English speakers because news in English looks plural but is grammatically singular. Catalan has:

• la notícia = the news item / the story
• les notícies = the news / the news stories

In this sentence, la notícia probably refers to one specific news story.

The order here is very natural in Catalan:

subject + verb + adverb + object

• el diari = subject
• explica = verb
• molt bé = adverbial phrase
• la notícia = direct object

So:

• el diari explica molt bé la notícia

You may sometimes hear other word orders for emphasis, but this neutral order is standard and common.

Normally no. In Catalan, que is usually required to introduce this kind of subordinate clause.

So you say:

• La meva opinió és que el diari explica molt bé la notícia.

In English, you can say:

• My opinion is that... and sometimes drop that in other structures.

Catalan is less flexible here, so que should stay.

You would need to change the verb form:

• Jo explico molt bé la notícia. = I explain/report the news story very well.

Compare:

• el diari explica = the newspaper explains
• jo explico = I explain

This is a good example of Catalan verb conjugation changing depending on the subject.