将下面的句子改为现在完成时态

That's just what I ------ -------(forget)!

forget 不是瞬间动词吗？
现完不是要加延续性动词吗、

have forgotten

忘记应该也理解成延续性的动词

1 mr liu became a teacher in 2000 mr liu _has__ been____ a teacher for __10(ten)___ __years_____ 2 my grandpa died in 2002 my grandpa __has_ _been___ _____dead for _ 8(eight)____ __years___ 3 i bought a pen last year i __have___ _had______ a pen for _2___ years___