Wow, that's a tough one without visuals here online...but I'll give it a go.
For my son, who couldn't tell time until he was 9, I printed up a series of clock faces on a paper, leaving off the hands.
I explained the time intervals between the numbers - the 1 o'clock spot is 5 minutes after the hour, 2 o'clock is 10 minutes after - and so on. Then we practiced with JUST the big hand drawn in. Whatever it pointed at, that numbers position was "X" minutes after the hour (don't worry about "minutes til" the hour yet). Once he had that down we went to JUST the small hand. If its pointing at the 1 o'clock position, its 1 o'clock, etc. Again, draw in JUST ONE hand for practice.
When there is a good grasp of both, draw them both into the printed clocks and practice.
After that, over time, you can tackle the other minutes (1-4, 6-9, etc), minutes "til", 1/4 and 1/2 hours, seconds, and digital.
Hope this helps :)
at 6:02 AM on Oct. 13, 2010