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Hi teachers.

Is it necessary 'does' in the following sentence or is it optional?

David speaks English more quickly than Juan (does), but Marta

speaks the most quickly of all of them.

Thanks in advance.
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It's optional. Also note that "fast" is more commonly used in combination with "speak" than "quick".
Comments  
Thank you so much for the help and the counsel Ivanhr. Emotion: wink