Examine the strum above, and listen to it's audio file. In order to play this strum, you'll need to ever-so-slightly lift your picking hand away from the body of the guitar, as you play the downstroke of the third beat, so the pick misses the strings. Then, on the next upstroke, bring the hand back closer to the body of the guitar, so the pick hits the strings.
To summarize, the upward/downward motion of the picking hand should not change AT ALL from the first pattern. Play along with the audio file of this second strumming pattern. Once you are comfortable, try it at a somewhat faster speed.
Things to consider:
- It is important to be able to play this accurately. If it's not perfect, it will make learning any harder strums impossible.
- Be sure that you can play the pattern many times in a row, without ever pausing.
- This is a tricky concept, and it may take you some time to get used to. Soon, it will become second nature.
- The more you practice this concept, the quicker you'll master it.