Give me some examples of foreshadowing in section 4?

This chapter consists largely between Crooks and Lennie. Crooks's personality is highlighted in this chapter. The foreshadowing comes from Crooks speaking about loneliness and isolation. He suggests that George may not come back to Lennie but quickly recants when Lennie gets angry. This, of course, foreshadows the reverse when George is forced to be alone after he shoots Lennie.