zhè / jiàn / shì / wǒ / yǐjīng / wán wán quán quán / wàngjì / le / nǐ / zài / tí / yě / méi / yòng

这件事我已经完完全全忘记了，你再提也没用。

I have completely forgotten about this matter, it's no use mentioning it again.