Review of Verb Types: Intransitive, Monotransitive, Ditransitive and Linking

[Updated on May 31, 2015 with minor corrections]
 
Here are syntax trees for four major verb types: intransitive, monotransitive (one object),
ditransitive (two objects),and linking verbs (an complement, but no object),

(A) The baby is crying
V- (Intransitive):
An intransitive verb has no object (in = not)

(B) I did my homework quickly
V+ (Monotransitive):
A simple transitive verb has one object
(direct object = "homework")

(C) I told my children a story
V++ (Ditransitive):
 A ditransitive verb has two objects
(direct object = "a story"; indirect object = "my children")

(D) I am a doctor
(E) I am angry
V= (Linking):
 A linking verb has no object, but it has a complement ("doctor" "angry")

The syntax trees appear below:

The baby is crying (sample syntax tree for intransitive verb)

I did my homework quickly (sample syntax tree for monotransitive verb)

I told my children a story (sample syntax tree for ditransitive verb)

I am a doctor (sample syntax tree for linking verb with noun complement)

I am a angry (sample syntax tree for linking verb with adjective complement)