posted by johni .
How does one diagram " He helps build the house" "helps" is not a helping verb, but "build" is not an infinitive, or is it?
In that sentence, "build" is an infinitive with the "to" understood. Hold on, and I'll try to find a good explanation.
OK, here you go:
He helps build the house.
He - subject
build the house - infinitive phrase which answers how? It is an infinitive used as an adverb and "house" is the direct object of that infinitive, with "the" on a slanted line below the word "house."
Diagram: infinitive as adverb: http://members.cox.net/teachro/diagramming/verbals/infadverb.htm
Then add direct object line with "house" on it...and "the" below.