1. The “Perfectly Correct” Signal

When your sentences are grammatically flawless but quite too formal-sounding, natives might think you learned primarily from texts. For example:

• Textbook learner: “I do not have any money with me at the moment.”
• Real-life speaker: “I don’t have cash on me right now.”

They are true, but the first one reads like it was written, not spoken. Ears that listen to native speech hear this “neat” quality and associate it with classroom learning.

2. Word Choice

Textbooks are likely to practice-safe words, formal words, or words outdated, but real-life speech is replete with colloquialisms.

• Textbook: “I live in an apartment.”
• Real life: “I live in an apartment.”
• Teaser: “May I use the restroom?”
• Real life: “Can I use the bathroom?”

If you understand textbook words in a comfortable atmosphere, natives can easily detect the “studied” source.

3. Idioms and Slang

Real English is full of idioms, phrasal verbs, and slang — all sloppy things textbooks try to avoid. A native might say:

• “I’ll grab a bite.” (eat something small)
• “I’m beat.” (tired)
• “That movie was a total flop.” (failure)

A textbook learner would answer: “I will eat something in a hurry. I am extremely tired. That film did not succeed.” Perfectly understandable, but without the cultural richness of conversation, TV, radio, and daily life.

4. How You Handle Small Talk

Small talk is a huge clue. In real life, people toss it around:

• “How’s it going?”
• “What’s up?”
• “Crazy weather today, huh?”

Textbook learners often respond too literally:

Q: “What’s up?”

• A: “The ceiling.” (since literally up)
  Or give a full, long answer to “How are you?” instead of the preferred short “Good, thanks. You?”

Those moments remind natives you studied formally but haven’t lived life in the rhythm of day-to-day conversation.

5. Your Comfort with Pace and Interruption

In conversations, natives often overlap, interrupt lightly, or trail off mid-sentence. If you’re used to textbook dialogues, where people take turns politely and always finish their sentences, real-life flow can feel chaotic. Natives notice when someone speaks in “clean turns” without the messy interruptions of real life.

6. Pronunciation of Function Words

Textbooks often teach every word clearly: “I am going to the store.”
Actual conversation blends them: “I’m gonna go to the store.” or even “I’m’nuh go t’the store.”

If you read each word separately and exactly, natives might be struck by your accuracy — but also recognize as a “learner pattern.”

7. Fillers and Hesitation Confidence

In real conversations, people use fillers like “uh,” “um,” “you know,” “like.” A textbook student will be quiet or say weird fillers like “How to say…” or “Ehm…” These subtle signals let natives your practice has been more book-based than casual.

 The Bottom Line

Native speakers can generally tell if your English was mostly learned from textbooks or from regular conversations by:

• how natural your vocabulary sounds,
• whether you use idioms/slang
• how you create casual small talk,
• and how your timing is in proportion with spontaneous speech.

But the point is: being “textbook” sounding isn’t so bad. It means discipline, organization, and proper grammar. Most natives actually prefer textbook-instructed English because it sounds more accurate than their own sloppy talk. After some experience, acquaintance, and practice, you can blend the formalities of textbooks with the informality of spontaneous talk — and that’s a powerful mixture.