You can't do what you want to do. Video frame rates are significantly less precise than audio sample rates. For example, with regular old NTSC DV video, you have approximately 30 frames per second; with the audio, you have 48,000 samples per second. Your only "kind of" option is to turn on Audio Time Units in the sequence--you'll be able to move the audio in smaller increments, but the video will still have to fall on even frame demarcations.
To turn on Audio Time Units, click the flyout menu in the top-right corner of the Timeline panel; select Show Audio Time Units.
when learning how to make a music video it says to add the test sounds and then sysc them up so my mouth timing would be on time and if i cant line them up seems wierd to not be able to
What Colin says above is the way to do it. It isn't weird to not be able to do it - just the way video works. Line up your audio to the video, not the other way around and you should be able to accomplish what you are looking for.
when learning how to make a music video it says
With 30 FPS Video, you can get quite close for the sync, as the Video will be one Frame per each 1/30th sec.
As has been stated, if you change your Timeline to Audio Units, you can adjust it (turn OFF the Snap function, or it will frustrate you) to 1/48,000th sec.
You cannot edit Video to less that one Frame, so that is a given, but you can align your Audio to a very exacting degree.
Once you get the first alignment done, you might be faced with a problem with the next cue point, and if that becomes the case, perhaps alter the speed of your Audio (retaining Pitch), by a very small factor.