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-His late emails were full of mistakes due to the fact that he was doing too many things a the same time.

-His late emails were full of mistakes due to the fact that he was doing too many things at a time.

Are these sentences both correct? Could you improve them? Thanks.
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-His late emails were full of mistakes due to the fact that he was doing too many things AT the same time.

-His late emails were full of mistakes due to the fact that he was doing too many things at THAT time.
Cheers Emotion: smile
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How about with no ' prep ' in the sentence ? does it sound right ?

His late emails were full of mistakes due to the fact that he was doing too many things the same time.
No, sorry WHL, you need a prep. to show the relationship between 'many things' and 'the same time'
So; many things AT the same time
Cheers Emotion: smile