Sam met Mary in England and visited her school.为什么用met,不用had

英语He met her and She met him.中的动词met为什么没有加S呢? He met her and She met him i dont think we have met before 中为什么不用had met you don‘t have to describe her.i (have met/had met/met) her 英语翻译Catherine and Martin met in England before they came to she met and married her husband----pierre` she met and married her husband----pierre she met her teacher and g___him politely Helen and her friends met their parentes at the school gate I first met her on May 3,2010 and fell in love with her,but I met an old English woman ,she had lost her way .这句话中为什么she “I met her yesterday.” he said to me.改为间接引语为什么有had呢?