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

So I wasn't under a contract but let's come back and fulfill that promise anyway.

虽然我们没立下合同,但是我们以后会回来履行这个承诺的

耶鲁公开课 - 博弈论课程节选

Mr Berlusconi's Forza Italia (Let's go, Italy) and its allies on the right also promise to spend a lot more on public works: this brings back fond memories.

ECONOMIST: Italy

It is the call we hear today, and as we come together to celebrate our national heritage, let us reaffirm our promise to preserve America's treasures for the generations yet to come.

WHITEHOUSE: Presidential Proclamation -- National Park Week, 2012

Let's hope he's not forced into making another apology for a promise he can't keep.

BBC: England