Brains of Bilinguals?

Yes,the brain works differently when we speak two different languages or even more, but it doesn't mean that your brain works differently when you speak English or Arabic. It means that your brain works differently as compared to monolingual people.

I don't know of any issues for people who want to learn new languages other than the fact that the older people get the more difficult it is for them to learn new languages, generally speaking.

But the language system of English is different than in Arabic.

For instance, when I speak English I have to make my brain used to put subjects before verbs, but in Arabic is the other way around. That is what I meant by saying "brain works differently".

I think what you're referring to is the way that the languages work differently, and you're cognizant of the fact.

So, this point is not related of how bilinguals' brains work, isn't it?

I thnk it is a similar process your brain goes through when writing your name with your dominate hand vs the other hand. If you are left handed, you can do most things with that hand without having to think about it. It is a natural activity. When you switch hands, you have to concentrate and intentionally direct your body movements until doing with your right hand also becomes second nature to you. The more you practice it, the more natural it becomes.

Correct.