He forgot our wedding anniversary. He didn’t even apologise for forgetting it.

Onlyafterhehadforgottenourweddinganniversarydidhenotapologiseforforgettingit.

Not only did he forget our wedding anniversary but he also didn’t even apologise for forgetting it.

Notuntilhehad apologisedforgettingourweddinganniversarydidheforgetit.

Hadhenotforgotten ourweddinganniversary,hewouldn’thave apologisedforforgettingit.