We have been good friends a long time.这里的a long time之前不用加for

We have been good friends a long time.这里的a long time之前不用加for we have been best friends for a long time中friends为什么要加s We have been waiting a long time.不用for a long time We _________ (be) good friends for a long time we have been best friends for a long time 为什么best前不加the We ---(be) good friends for a long time.用所给词的适当形式填空 "i have been for a long time"中,"have" 为什么不用"had"? they have been friends（ for a long time） 括号部分提问 l have been looking for someone for a long time 英语学习 单句改错1.They have become good friends for a long time.2.H I'm going away for a long time.为什么这里going后面不用加to呢? Have you been here for a long time?