不知道你是否英文

i will not blame you that if you don't lie to me ,i will appreciate it.On the contrary. No one will know whether he spot this unbelieveable secret or not. 第一个句子好像不怎么地道,但也只能是这样了.that 引导的宾语从句中有个if条件状语从句.

I'm wondering whether you know this.

I don't know whether you like flowers.我不知道你是否喜欢花希望能帮到您

I don't know whether you can help me.希望可以帮到你。