✨ Basic Meaning
🎯 Primary Function
📋 Grammar Structure
🎭 Usage Contexts
Can be used in formal contexts to express a strong resolve or the unavoidable need to take action.
Commonly used in informal speech to convey impatience, urgency, or a personal resolve to change a situation.
Frequently encountered in essays, news articles, and literary works to express critical situations or determination.
Often heard in daily conversations, especially when discussing time constraints, responsibilities, or urgent matters.
💡 Common Applications
📌 Important Points
⚠️ Common Mistakes
🏛️ Cultural Context
🔍 Subtle Differences
📝 Conjugation Notes
Always attach to the て-form of a verb. It cannot be directly attached to nouns or i-adjectives. For negative forms (e.g., “cannot not do X”), it becomes complex and is usually rephrased.
🔊 Pronunciation Tips
Pronounce 「てはいられない」 as a single phrase with a slight emphasis on 「いられない」, indicating the strong negative nuance. The 「は」 is pronounced as 「wa」.
🧠 Memory Tips
Think of 「てはいられない」 as “cannot stay doing [action]” or “cannot afford to remain [state].” The “いられる” comes from いる (to be/stay) + られる (potential/passive), hence “can stay,” and “いられない” is its negative “cannot stay.”

I’m a software engineer based in Japan, with experience in developing web and mobile applications. I’m passionate about technology, especially in DevOps, AI, and app development using platforms like AWS, Flutter, and Node.js. My goal is to build a website that shares knowledge about the Japanese language and IT, helping everyone learn and grow more easily in the digital era.