Find and correct the mistake in each sentence. 1. by midnight, i had drink five glasses of 2.by 6 o'clock,we had watchen three 3. she has walked ten kilometres by two o' 4. danny is danced for an hour by 8 5. katarina had sleeped for two hours by 6. by last week,freya has sold 150 7. by the time he arrives,she had waited for 40