I always thought this sentence didn't contain an object complement. I assumed the direct object of making was "(to be)happy" and "him" was the actor. Apparently, I'm wrong. Anyone care to explain? And what about this sentence, "She made me study"

"To play checkers was exciting for him" vs. "For him to play checkers was exciting".

Are these sentences the same? And someone can explain to me the "for him" part in both sentences. Why do we need a "for" in the second sentence.

"That was a bad decision for him"

Same problem here, I don't understand what "for him" modifys. Either adverb for "bad" or adjective for "decision".

"Find the area of the triangle and its length"

I know this sentence is regarded as "(find) (the area of the triangle) (and its length). But I began to overthink it, and found out that (and *ANYTHING*) can also be another object of the preposition. Can someone rephrase the sentence and a rule regarding this confusion?

(Borrowed from a website) " - "The red-haired ice salesman took a business trip to the head of a comet," the prepositional phrase to the head tells where the trip was taken and so modifies the verb, and the prepostional phrase of a comet is an adverb because if modifies the prepositional phrase to the head." -"

Is this correct? I thought that "of a comet" is an adjective modifying head

OHH AND.

How do I tell the difference between the actor of a noun infinitive phrase, and a direct object with infinitive as a complement.

"I want her to be there" vs. "She made me be there"

THANKSS!