All comments are appreciated.
(1) I believe that there are at least two ways to analyze your sentence.
(2) Mr. Antonson, who has taught me so much about the Reed-Kellogg diagramming system, has given you one
excellent analysis.
(3) May I give you
another analysis? (You did welcome "all comments," even those from this humble soul.)
(4) I should analyze your sentence this way:
I = subject
saw = verb
the car (to) disappear. (infinitive phrase that is the object of the verb "saw.")
(a) "the car" is the subject of the infinitive "(to) disappear."
(i) One book (
A Grammar of Present-Day English by Pence & Emery) explains:
The infinitive without
to ... is often used in infinitive clauses following certain verbs , such as
let, help, make, see, hear, etc. They give these examples:
I felt the ground shake (= I felt the ground to shake); Did you see him run away? ( = Did you see him to run away?) REMEMBER: in such sentences, native speakers do NOT say "to."
(5) Here are some more examples. (You may choose to analyze them as objective complements -- as did Mr. Antonson -- or infinitive phrase/clause as do some books):
I saw him
leave.
I heard her
sing.
She made me
laugh.
(P.S. Those three examples come from House & Harman's wonderful
Descriptive English Grammar. I wish to
emphasize that they call them "objective complements" -- as does Mr. Antonson.)