&gt; In my case, I speak two languages every day, and have done so for decades. I often say or write things that are syntactically incorrect in both languages.<p>I also have spoken two languages (EN&#x2F;PT) almost every day for 15 years, but it&#x27;s my spoken English that, at times, adopts the syntax of my Portuguese. I&#x27;m very careful to not let English &quot;corrupt&quot; my PT for fear of sounding off, but I&#x27;m wondering if I&#x27;ll end up following your lead in about 10 years (mixing up both).