I_(buy) a beautiful pen.----when _ you_(buy) it?填过去时是错的、我填的就是过去式、 老师说是错的、

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I_(buy)abeautifulpen.----when_you_(buy)it?填过去时是错的、我填的就是过去式、老师说是错的、I_(buy)abeautifulpen.----when_you_

I_(buy) a beautiful pen.----when _ you_(buy) it?填过去时是错的、我填的就是过去式、 老师说是错的、
I_(buy) a beautiful pen.----when _ you_(buy) it?
填过去时是错的、
我填的就是过去式、
老师说是错的、

I_(buy) a beautiful pen.----when _ you_(buy) it?填过去时是错的、我填的就是过去式、 老师说是错的、
I have bought a beautiful pen,when did you buy it?要用现在完成时.

will buy
will you buy
这样也行吧

i bought...
when did you buy