I've spent almost two weeks in Sweden now, and it's pretty much the first time in a year and a half that I have used my first language on a regular basis.
I don't have an accent I don't think. But I do the same thing that I do in the US, a subtle mixing of the languages that I don't think anyone but me can really hear.
If I intend to start a sentence with a "maybe", when I am in the US out will come a "kanske", which is the Swedish word. In Sweden, in the middle of my Swedish sentence there will be an "I don't think" or a "how" where there should have been "jag tror inte", or "hur". It's like my brain knows no difference, and all the words are happily swimming together.
Which reminds me of when my bilingual Mexican American friend heard himself say that he had to go help another friend move her ropes.
Her
ropes? That made no sense to anyone.
What he meant was her
ropas, which is Spanish for clothes. She was moving houses. His brain had mixed Spanish and English, all on its own. That's how I feel too.