ago (常和一般过去时的动词连用)以前
如:I met him a few minutes ago.
six years ago
long ago
before (常用于完成时)在...之前
如:I have never seen the movie before
ago (常和一般过去时的动词连用)以前
如:I met him a few minutes ago.
six years ago
long ago
before (常用于完成时)在...之前
如:I have never seen the movie before