If it had been Inglethorp who was carrying on an intrigue with Mrs. Raikes, his silence was perfectly comprehensible. 
If there had been an affair occurring between Mrs. Raikes and Inglethorp, Inglethorp's silence was completely understandable.
It was incomprehensible that Inglethorp should remain silent, if he had been having an affair with Mrs. Raikes.
there is more then one bike
Three people are sitting on a bench.
The naves are built of ceramic and wood.
The cheeleaders are sitting down
A man is fishing at the pond with two young boys.
It sounded like she were next to me as she cried