since的八种用法详解
1、接时间点：如 I have stayed in that country since 1995.要求：谓v.用现在完成时,而且须是延续性动词. 2、接一段时间 + ago：如 They have lived in that house since two years ago.要求：谓v.用现在完成时,而且须是延续性动词. 3、接时间状语从句：如 I have loved her since I met her last time./ Lily has stayed at home...