guarantee not not to?

说实在的我真的不知道你是想表达什么意思.下面就我知道的说说,希望能对你有所帮助：
guarantee作为动词是（向某人）担保某事物；保证
通常会这样用：guarantee sth.(to sb)或guarantee to do sth.例：
Α.I cannot guarantee the punctual arrival of trains in foggy weather.我们不能保证火车在雾天正点到达.
Β.I can guarantee it's true— I saw it myself.
我能保证那是真的— 我亲眼所见的.
C.We guarantee to deliver within a week.
我们保证一周内送到.
E.This food is guaranteed additive-free.
改实物保证不含添加剂.
F.We guarantee you delivery within one day.
我们担保你在一日内收到.
●假如你的问题是想问：“保证不做某事”那一定要用:
guarantee not to do sth.例：
I guarantee not to be late again.我保证不再迟到!