The usage of でも


I am getting a bit confused with the multiple uses of `でも`. Permission, even
if, without doing, etc.

I have the following 2 sentences to translate. **Note - these sentences might
not be valid**

>   1. わからないでも言って下さい  
>  Please say it without understanding.
>

>   2. 二時間おきでもいいです  
>  Even every 3 hours is okay.
>

Are these sentences valid, and if so, are my translations correct?




There is two ways I can see for your first sentence. First you could write it:

> わからない。でも、言って下さい

In this case you would separate it in two sentences meaning: "I don't
understand. But say it"

In which case, it is the closest if I try to not change your japanese
sentence. If I go the other way around by trying to not change your english
translation, I find it better to say:

> わからなくても言って下さい

On your second sentence, few changes ought to be made. If what you want to say
in english is "Even every 3 hours is okay", I would rather say it this way in
Japanese:

> [毎三時間]{まいさんじかん}でもいいです。

