1 关于过去式的问题：
种类一 When did you first ...? （一般很久以前）
Did you ...when you were a child?
如：When did you first visit a museum ?
Wow, let me take a trip down memory lane! It must have been when I was 5 years old. I remember....
let me take a trip down memory lane (To reminisce over memories of past events, especially happy ones )
或者：
If memory serves如果我没记错的话, the first time I ever went to a museum was when I was in elementary school, grade 3....
或者：
That's easy! I have a memory like an elephant! It's still flesh in my mind!My first visit to a museum was when...
have a memory like an elephant（To have an exceptional memory）
种类二：
When was the last time you (did sth.)? (比较近期发生的事)
When was the last time you went shopping?
如果时间比较近，最近就做过，那么可以尝试just the other day/just the other week 不久前的某天 （一般不超过两周）
如：Oh, I went shopping just the other day. That was a sale on at the mall, so I picked up a bunch of bargains at rock bottom price.
如果很久很久没做这件事了，那可以说a month of sundays
如：It's hard to remember! To tell the truth, I haven't been shopping in a month of sundays because I've been too busy with my studies.
种类三：Have you ever...
可能会问
How many times have you ever done...?
Have you ever done...?
如：
Have you ever travelled in a plane?
No, I haven't. To be honest, it's kind of a pipedream (白日梦). I haven't even been outside my hometown yet.
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