You tell you know it but obviously you don't, the eight notes on the staff are the melody line, not the strumming notes for the chords, they are not related to the strumming pattern in such a way as you think with other words, if you can sing then the notes on the staff is what you would sing and the chords that are above the staff is what you would play on the guitar with the proposed strumming pattern to accompany yourself while singing.