since引导的主句和从句各用什么时态

since的用法：译作“自从…以来” (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./ L