Wrightkd just gave you a good one, and it's pretty straightforward for one to interpret.
Another good one occurs when in chapter 4 the guys go into town to Ol' Susie's place. Lennie wanders into Crooks place and Crooks challenges the relationship of Lennie and George. Lennie says:
I been with George a long time. He'll come back tonight-"
This shows the confidence Lennie has in George. Although, moments later he questions if George really will come back. Lennie relies on George as a father figure who takes care of him. He would be crushed if George didn't return. Crooks reaffirms for him:
You got George. You know he's goin' to come back. S'pose you didn't have nobody.
Crooks is trying to make Lennie realize how much he should value having the relationship with George that he does have.