Match the shift in verb tense reference to the correct solution: An
unnecessary shift in tense
Solutions:
a. When two or more events occur at the same time, be sure to use
the same verb tense to describe both or all events.
b. Shift from the past tense to the past perfect tense to indicate
that one action began and ended before another past action
began. Use the past perfect tense for the earlier of the two
actions.