Whoa! Back up the truck.Originally Posted by tdol
IMO, the two objects are "his father" (IO) and "his sincerity" (DO).
Do you see it differently?
I'm getting lost here, let me rewind. ;-\
Sorry; I was talking at crossed purposes here. I got the idea that 'by...' was supposed to be the indirect object. You're right- there are two objects.
If we change the order of the constituents, like this,He showed his father his sincerity by cooperating with all his teachers at school.
By cooperating with his teachers, he showed his sincerity to his father.
we see that the phrase 'to his father' is the IO and that 'his sincerity' is the DO. The phrase ''by cooperating...' functions as an adverb: It answers the question "By what means (did he show his father his sincerity?)".
All the best,
PhewOriginally Posted by MikeNewYork