学生疑问:
1. I was down with the flu a couple of months ago and I cured myself.
2. I’ve had headaches off and on for the last few years, but none was as bad as this.
老师答疑:a couple of months ago →从现在算起“两个月之前”的那个时间点(当时我得了流感,现在好了)。强调的是过去的一个事件,所以用一般过去时。for the last few years →从几年前到现在持续的一段时间(断断续续头痛)。强调持续到现在的状态,所以用现在完成时(have had)。
分析点评:ago = 站在“现在”回头看,指着过去的某个点。for =画一条线,从过去的某个点一直连到现在(或某个终点)。