是我违背了诺言 英文

It is I who broke the promise.

这是强调句，强调是“我”

或是：

I broke the promise.
一般的表达

It is me who broke the promise.
书面表达。口语一般不这么用

口语表达：
I broke the/my promise.

i can't keep my promise 我没有遵守我的诺言

I have broken my promise.

I broke my promises.