Intonation conveys meaning in spoken English English. 

Verbal Communication Incomplete Without Proper Contrast in Tone

Those who speak with accurate intonation are understood by native speakers. 

Function of Intonation

Intonation provides attitude and emotions to verbal speech. If a foreign speaker uses the wrong grammar he will not be thought of in a negative manner. If the speaker uses the wrong intonation, he will be thought of as having the wrong attitude.

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