把after 改为since.Its 应该是it's【改错】After we said goodbye to you,we went to Washington D.C.,where we stayed for three days.老天，你是提几个问题的主？把them改成us.不甚感激【改错】After we said goodbye to you,we went to Washington D.C.,where we stayed for three days.你这样问好像不太厚道吧，我做了三件事只等于一件？把said前加上had.【改错】My brother was so much fond of the museums there that he begged my parents to staying another couple of day. 好人做到底吧把staying的ing去掉。