“我向你保证”用英语怎么讲？

as.sured; as.sur.ing; as.sures;
To inform positively, as to remove doubt:
向…保证告知确实如此，以解除怀疑：
assured us that the train would be on time.
向我们保证火车将会准时到达
To cause to feel sure:
使确信：
assured her of his devotion.
使她确信他的挚爱
To give confidence to; reassure.
给予信心；使放心

I promise you~~

You have my word
I assure you that
==

I assure you

I promise to you