Italian, my native language, for the majority but I admit I started using ATRL lingo also in my mind sometimes or english expressions that are more effective to represent a concept.
Albanian and sometimes English ... when i try to motivate myself i tend to speak with myself in german (even tho im not veu good at it), makes me feel more confident idk why
Both my native language (Czech) and English, depends on the situation (like if I'm about to write/speak in English etc.). I feel like sometimes it helps me to think in English, because it somehow feels like a different perspective, I don't know why