Types of the compound verbal modal predicate and their use in sentence in english

parted enemies.
But: He went mad. (compound nominal, because “went” is only a link verb here.)

Mixed types of the predicate

They combine elements of different types of predicate:

1. 
   The Compound Modal Nominal Predicate
   

It has a modal verb and a link verb:
She couldn’t be happy.
Jane must feel better pleased than ever.
2. The Compound Aspect Nominal Predicate
It has an aspect verb and a link verb:
He was beginning to look desperate.
George stopped being ashamed.
3. The Compound Modal Aspect Predicate
It has a modal verb and an aspect verb:
You ought to stop doing nothing.
He can’t continue training.
4. The Compound Modal Aspect Nominal Predicate
It has a modal verb, an aspect verb and a link verb:
You must stop being lazy.

Agreement of the predicate with the subject

In the English language the predicate agrees with the subject in person and number. Below are some rules of agreement:
1. When two or more singular subjects are connected by the conjunction and or asyndetically, the verb is plural.
Mary and Helen like cheese.
a) But the verb is singular if the two nouns express one person or thing, or is considered to be a unit.
Bread and butter is wholesome food.
This bomber and its cargo probably weighs over a hundred tons.
The sum and substance of all she says has no effect.
The painter and decorator has fallen off the fence.
b) There is a strong tendency to use the verb in the singular when the verb precedes a number of homogeneous subjects and the first is in the singular:
There is a bottle and three glasses on the table.
Here is Tom and Jerry.
In the distance was heard the applause and the shouts of people.
There was a concert and dancing in the hall.
c) The verb is in the singular if the subjects are expressed by infinitives:
To do homework and to eat sandwiches is very interesting.
d) If two attributes characterize one subject in the singular but denote two persons or things, the plural verb is used.
Vertical and sloping writing are both allowed.
In modern hotels hot and cold water are supplied.
American and Dutch beer are both lighter than British.
A black and white kitten were playing on the table. (2 kittens)
e) The singular is required when “and” introduces something in parenthesis:
The Prime Minister, and perhaps the President, is coming.
2. Agreement depends on the conjunctions the subjects are joined by:
a) If the subjects are connected by the conjunctions as well as, rather than, as much as, more than, together with, with, the predicate agrees with the first subject.
The teacher as well as the students is present.
I as much as they am ready.
b) If the subjects are connected by the conjunctions not only … but, also, either … or, neither … nor, the predicate agrees with the nearest subject.
Either you or I am right.
Neither the teacher nor the students were present.
There was not only the teacher but also some students at the lesson.
3. If the subject is expressed by the pronoun, the agreement is as follows:
a) The pronouns somebody, someone, anybody, everybody, everyone, everything, each, either, nobody, no one, neither, etc. have a singular predicate.