three murders -------(happen)since the end of last year but l can't remember the murderers'names

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three murders -------(happen)since the end of last year but l can't remember the murderers'names

three murders -------(happen)since the end of last year but l can't remember the murderers'names
three murders -------(happen)since the end of last year but l can't remember the murderers'
names

three murders -------(happen)since the end of last year but l can't remember the murderers'names
Three murders ---have happened----(happen)since the end of last year but l can't remember the murderers'.
自从去年年末起,已经发生了三件犯罪事件,但是我不记得了那些罪犯了.
since引导过去完成时.