He used sign language telling her "I 've spent a year' s time to learn sign language. Just to let you know that I 've not forgotten our promise."

他用手语告诉她：“我花了一年的时间来学习手语，我只是想让你知道，我没有忘记我们的诺言。”

youdao

If you have not seen the calculus that I'm about to use on the board, or more likely, if you've forgotten it since high school, don't panic.

如果你们没有见过我将要,在板书上写的表达式,或者说,高中毕业你们就忘了,没关系

耶鲁公开课 - 博弈论课程节选

How we reconstruct our economy to generate sustainable growth, and how - in the meantime - we cope with flat or declining living standards, are the themes of those films that I mentioned earlier (in case you've forgotten, 4 December and 11 December on BBC Two).

BBC: UK's debts 'biggest in the world'

It was just, 'Come, we want you, ' and I've never forgotten that.

WSJ: Journalist and author Haynes Johnson dies at 81