Yes, many learners start to automatically think in their target language, even at intermediate or lower levels, though it often happens in short bursts or for simple thoughts. This automaticity is a sign that your brain is building direct connections to the new language, not just translating from your native tongue. It can occur after months or years of consistent exposure, but it does not require full fluency.
When you think in a language without effort, it usually means your brain has internalized enough vocabulary and patterns to form thoughts directly. For example, you might find yourself mentally narrating your actions ("I am opening the door") or reacting to situations ("That is hot") in the language. This happens because your brain seeks efficiency: once a language becomes familiar, it shortcuts the translation step. However, these thoughts are often limited to topics you have practiced or encountered frequently. You might think in Japanese for routine tasks but still default to English or Polish for abstract, emotional, or complex ideas.
A key tradeoff is that automatic thinking does not equal mastery. You can think in a language and still make many errors or lack vocabulary for deeper conversations. In fact, early automatic thinking can sometimes lead to fossilized mistakes if you do not actively correct them. The benefit is that it builds fluency and reduces mental fatigue over time, making the language feel more natural. The risk is that you might overestimate your ability if you rely on these automatic thoughts as proof of progress.
To encourage this automatic thinking, focus on immersive activities that match your current level. Listen to podcasts or watch shows with subtitles in the target language, even if you do not understand everything. Practice speaking out loud to yourself, describing your day or surroundings. Use spaced repetition systems to solidify high-frequency words and phrases. The goal is to make the language a habitual part of your inner monologue, not to force it. If you hit a block, it is fine to switch back to your native language; the automatic switch will strengthen with more exposure and practice.
Remember that everyone's path is different. Some learners start thinking in a new language after just a few months of intense study, while others take years. The important thing is to keep engaging with the language in ways that feel meaningful and enjoyable. Over time, your brain will naturally build those direct pathways, and thinking in the target language will become more frequent and effortless.