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Is this paragraph free from mistakes:



"Language teaching at schools may give one a FAIR foundation of the language, but it is still not enough for someone to communicate effectively.

They say that in a social context, people use in average about 2500 words., and maybe the best students actually achieve a vocabulary of that range.

But while that could be sufficient for a given stituation, it could be too little for another."

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Language teaching at schools (I'd write "in school") may give one a FAIR foundation of the language, but it is still not enough for someone to communicate effectively.

They say that in a social context, people use in on average about 2500 words., and maybe the best students actually achieve a vocabulary of that range.

But while that could be sufficient for a given situation, it could be too little for another. (It works as written, but I'd write "But while that could be sufficient in one situation, it could be too little in another.")