On the other hand, a person uses the most basic vocabulary but speaks effectively and without any effort. He speaks just like native speakers, fluently. Native speakers don't use big words. Phrasal verbs and If you have read books to crack English tests, you might have used words like 'gregarious' but in real conversation, 'friendly' would suit more.
Examples of conversation:
1. Sorry, I give up. I can't solve this problem.
2. I am looking for my mobile phone.
3. I must get on with my work. I got behind because I went to the movie.
4. I'll come and see you off at the railway station.
5. I feel he has got something weighing on his mind.
6. I don't like the way my nephew answers me back.
7. This bookshop owner is a rude guy. Doesn't let one flip through any magazine book before buying it.
8. I am really sorry for holding you up but its important to sign all these papers.
9. I was calling her on her cell phone since morning but I couldn't get through.
10. Hey, would you be able to put me up when I am in Delhi next week? (Will you let me stay at your place)
The sentences are just to give you an indication that simple language works well and better. It doesn't mean that you shouldn't learn big words. But the harsh reality is that if you have to speak fluent English, don't waste time on books that teach you tougher words instead of basic language.
The result of such books that promise to teach 'hi-fi' language is that you only end up getting confused. Speak the most basic words and then there will be no worry about pronunciation either. And you won't appear superficial either.
Best of Luck.