Here are some riffs using sixteenth notes. If you have trouble with the rhythms, practice them on one note until you are confident with them and then try the whole example. All the notes here are from the A minor pentatonic scale. Notice the use of staccato notes in example 36.1
Sixteenth notes are often used within a beat in conjunction with eighth notes or rests, as shown in the following example. Once again, practice the rhythms on one note at first if you need to.