Help me out here please

hi guys im daniel im new here,im from south america and i've been trying to learn english lately as much as i can,feel free to talk to me by messenger or aol im there if u want to do so,well back to my question

how would i say this:1,i wouldn't even have done that or i wouldn't have even done that

2.how can a restaurant not have what they offer u? or how can't a restaurant have what they offer u?

3.i would still have thought about it ,is it correct?

4.i wouldn't rather have seen her or i would have rather not seen her or i would rather have not seen her

5.i would rather have done or i would have rather done

6.how could i have not done what she said,is that correct?or how couldn't i have done what she said

thanks a lot for your help,i reallllyyyyy like the web and the forums they are really helpful,and remember feel free to talk to me i want to practice some english,haha