Đáp án:I've never tasted a more delicious cake than this one.

             hoặc I've not tasted such a delicious cake before 

`-`This is + the +most+adj/adv(dài) + N + S + have/ has +ever+Ved/ PII.

                       adj/adv(ngắn)-est

`->`S+have/has never +Ved/PIII+(a/an)+so sánh hơn+N+than+(this/that....)+(one/N)

        hoặc S + haven’t/ hasn’t + Ved/PIII + such a/ an + adj + N + before.