In further answer to the question of what I meant by saying 'compelled by context', here's an item from Lee Child's 'Nothing To Lose', c.2008, page 348.
 
Reacher was hungry and he needed more coffee, so he led Vaughan another block north and another block west to the diner. The place was practically empty. Too late for breakfast, too early for lunch. Reacher stood for a second and then slid into the booth that Lucy Anderson (had) used the night he (had) met her. Vaughan sat across from him, where Lucy had sat. The waitress delivered ice water and silverware. They ordered coffee, and then Vaughan asked, "What exactly is going on?"
 
The two 'had's in (brackets) are incorrect and should have been eliminated by a copy editor. The 'had' which is underlined is correct, and is compelled by context. Lucy was not there when Reacher and Vaughan sat down for coffee.
 
.brad.04aug08.

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