They look sick. The verb modifier tells us how they look like. I am angry. Here, "angry" modifies the subject (I), the noun; therefore, "angry" is an adjective.
I have to do something = I have something to do. SVO on second thought.
7. No sentence crosses my mind where the infinitive phrase is not an object. The objective of my plan is to succeed. T
I thought since ‘he’ and ‘himself’ refer to the same person, there is no need to put ‘himself’ into the ‘O’ category? They refer to the same person, however from two different point of views.
if you say that BORING in this case is a COMPLEMENT (C) you will not make a mistake, but being more specific, you can state that this is the case of PREDICATIVE ADJECTIVE.
Check in QUIRK-GREENBAUM / p. 336 (verb complementation)