I have forgotten 和I forgot的 区别

问题描述:

I have forgotten 和I forgot的 区别
例如 How much does the course cost you?Sorry,I (have forgotten).I'm afraid.练习册的答案是这个 但是想不通.

I have forgotten我忘了(到目前为止)
I forgot我忘了(过去,与现在无关)