小蜗牛1990百度贴吧:改错He ha already learned English for three years befor he left for America

改错He ha already learned English for three years befor he left for America He can already _____(说) the time. He had already posted the letter ____five yesterday. 改错：What good a boy he is! He works too much hard 改错 改错：out of the house quickly as I could .The whole street was already “He had already posted the letter by five yesterday.”为什么要用介词"by"? Has he already visited many places or not?肯定和否定应怎样回答? whe he ended,every one laughed louder than everg改错 改错:He worked hardly on the project and was successful.