这个英语句子造得对吗

加上一个介词来说明您'偷偷'做的原因就对了.

I do it secretly [for] not wanting her to know.

i do it secretly,i dont want to let her know.
如果是你已经做了就把第一个DO改成DID
如果是没做就加上WILL在I 后面

wanting her not to know

不对。