Codeswitching

I totally agree that codeswitching is useful for bilinguals, the reason being is in my last job I worked with some peruvians. At my job they would be talking to me in English then something would drop and I would hear an alien word, just to learn they were swearing or making some comment or phrase in their own language. It was also funny to hear them say bless you in their own language when someone sneezed. So, I do believe not only is it exceptable but it also carries more meaning in one language than another for a bilingual.