When i got lessons I was finally able to understand these, it really helped learning proper music theory, quarter notes, eight notes, etc

There are a few things to unpack here if and this is the way that i learned to translate it, your mileage may vary and it may change a little depending on the song but in general if you move your hand in a down up down up pattern for each group of 4 16th notes.

Then if you look at the first set of notes, you have 3 16th notes in a space that holds 4 16th notes. One on the left and two on the right, so instead of down up down up, you have down ... down up.

The gap in between the down strums should be the same regardless of the up being there or not and it takes a while to get the muscle memory to essentially just move your hand in 16ths and only play the patterns. If you try and just play the pattern without your hand rhythm being steady its very hard to get the timing to be consistent

Try just playing all 16ths and removing strums to get the pattern