As a teenager, I often wonder "What makes a good citizen ?

You can actually omit the quotes and question mark here if you want (and lowercase the w if you do)

I think it's someone who doesn't break the laws, who is kind withto other people and who volunteers to help others.

You usually need to specify what people are volunteering for.

But now, the citizenspeople aged 18 to 30 are less likely to improve their citizen'ship skills than before.

"citizens" sounds a little unnatural here in my opinion.

It's also a little unclear what you mean by "citizenship skills". Possibly you mean "civic participation"? It's not something that's usually framed in terms of skills in English.

In Portugal, to fight against the weakendeclinge of people's confidence in ecnomy and politic, theypolitics and the economy, they've (who?) created the association "MyPolice".

"They" would be referring to some previously mentioned group, but it's not clear

They go into schools, and pupils have tohave the pupils do the same tasks asthat we ask tof all citizens.

"pupils" are (usually) citizens, but the way this sentence was originally set up implies that pupils and citizens are two distinct groups.

I think it's a good way to prepare them as future citizens.

The politicians who go to the schools take the pupils very seriously and ithat's a really good thing.

As a result of the goodpositive impact of this associatioon, other countries like Italy are now doing the same things.

Plain "good" and "bad" often sound a bit too simplistic in this kind of formal writing, so more specific adjectives (like "positive" in this case) read more naturally.

Thanks a lot for reading !

I think it'’s someone who don'esn’t break the laws, who, is kind withto other people, and who volunteer.s

In fact, you can say "does volunteer work" and can keep all the "who" to keep it formal, or take it away to make it sound more naturally

But now, the citizens aged 18 to 30 are less likely to improve their citizen'svic skills than before.

Actually, we just say “citizens” in general statements. And we use “civic skills” for these skills related to being a good citizen.

I think it'’s because we don't talk very seriously about this subject’t discuss this subject seriously enough at school.

In Portugal, to fight against the weakening of people'’s confidence in the economy and politics, they created the association "MyPolice".

They go into schools, and pupils have to docomplete the same tasks as we ask tothat are expected of citizens.

I think it'’s a good way to prepare the future citizens.mselves to be good citizens in the future

The politicians who go to thevisit schools take the pupils very seriously, and it's a really good thing.

As a result of the goodpositive impact of this associatioon, other countries like Italy are now doing the same things.

As a teenager, I wondered "What makes a good citizen ?

tense = past, add -ed

I think it's someone who don't break the laws, who is kind with other people and who volunteer's.

the form here tends to have and s - they do it continuously