我向你保证的英文

我保证: by my trothExamples:1. 他向我保证星期五一定准备好. He gave me an assurance that it would be ready by Friday.2. 我保证我没有告诉过任何人。 I didn't tell anyone, on my oath.3. 不客气。我保证您会发现我们产品的前景非常美好。 My pleasure. I can assure you that you'll find very good prospects in our products.