This pattern is taken from the original Tomlin version which is pretty open as far as patterns go because the main accents all fall exactly on the beats and the upstrums just beforehand only serve to move the track along.
If you don’t have a copy of the track handy then try finding it on YouTube or Spotify so you can play along.
I’ve listed this in a box format that shows the song over a single bar in a 16th note format. So the key is to count 1 E & A, 2 E & A, 3 E & A, 4 E & A over the song and crucially KEEP YOUR HAND MOVING at all times. Naturally your hand should strum down on the numbers or beats (1234), the &’s and then the up beats should always link to the E’s and A’s. If you find this difficult to work through on paper then I’d recommend either our Song Learner series DVDs or Intermediate Acoustic DVDs as its much easier to see it on video than in an article.