The document discusses William Bull's framework for describing tense in discourse. Bull's framework establishes an axis of orientation that a speaker uses to place themselves in relation to another event. This framework can be applied to both Spanish and English. The framework helps explain why ESL students may "discourse hop" by changing tense without shifting axis. Examples are provided of coherent and incoherent uses of tense related to the axis. Teaching methods are suggested to help students understand and properly apply tense through interacting with a visual model of Bull's framework and practicing shifting the axis of sample text.