Y. State United Teachers Union had sued the Board of Regents last spring, after the board decided to allow up to 40 percent of a teacher's evaluation to be based on scores. "-- What has happened here is that 'had sued' predates another past event in the greater context, while the verb in the dependent clause ('decided') remains in the simple past (a common phenomenon: only the main clause will normally take the past perfect.
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Mister Micawber"The N.Y. State United Teachers Union had sued the Board of Regents last spring, after the board decided to
allow up to 40 percent of a teacher's evaluation to be based on scores."-- What has happened here is that 'had sued' predates another past event in the greater context, while the verb in the dependent clause ('decided') remains in