for+一段时间
to - - - 到某个时间
比如说：1 He has worked here for 6 years (他在这里工作已有6年了)
2 He waited here for you for nearly 2 hours (他等你差不多两个小时了)
3 She worked here in our factory from 1997 to 2009 (从1997年到2009年他在我们工厂工作)
4 Wait for me till / to 7:00pm (请等我等到晚上七点吧)