因为你就是承诺英文怎么说?

Because you are the promise.
promise
vt.
允诺, 答应
n.
允诺, 答应, 许诺

Because you are my promise.

Because you are the pledge

Because you are the promise.

- Because you are my vow.

Vow means a solemn promise...

Because you are the commitment!
commitment我觉得比较好，是一种心里的承诺和默契，不一定是口头上的更不是誓言