The verbals

NON-FINITE FORMS
NO
person, number, mood
predicate
YES
tense and voice distinctions (relative)
Double nature (nominal and verbal)
Predicative constructions

NON-FINITE FORMS
The participle
The gerund
The infinitive

THE INFINITIVE
a noun derives from a verb stem

Characteristics
Nominal
Subject
To do that was dangerous
Predicative
Her plan was to marry him
Object
He never learnt to read
Verbal
Take a direct object
He liked to read poetry
Modified by an adverb
I cannot do it so fast
Voice and tense distinctions

Tense and voice distinctions

The indefinite (simple) infinitive
expresses an action simultaneous with the action expressed by the finite verb. It may refer to the present, past or future.
I am glad to meet you.
I was glad to see Mr. Paul.
Mr. Forsyte will be very glad to see you.

The continuous infinitive
also denotes an action simultaneous with that expressed by the finite verb, but it is the action in the progress.
He is sure to be working in the laboratory.
They must be still having a rest at the sea.

The perfect infinitive
denotes an action prior to the action expressed
by the finite verb.
«I am glad to have seen you» he said.
I am glad to have taken your advice.
I am sorry not to have been present at the meeting.

The perfect continuous infinitive
denotes an action which lasted a certain time before the action of the finite verb. It is not only a tense form, but also an aspect form.
All this time the boy seemed to have been admiring you greatly.

The voice distinctions
The infinitive of transitive verbs has special forms for the active and the passive voice.
It is so glorious to love and to be loved
The translation must be done in time.
It can't be changed overnight.
There is no time to lose. / There is no time to be lost.

‘BARE’ INFINITIVE
1) After auxiliary verbs:
I don't understand the meaning of this passage.
2) After modal verbs except the verb ought:
If one cannot have what one loves, one must love what one has.

3) After verbs denoting sense perception,:
I never saw you look so before.
We often heard her sing over the radio.
4) After the verb to let:
Let him go now.
Let us be friends.
5) After the verbs to make, to have in the meaning of «заставлять»
What makes you think so?
I had them take my baggage.
BUT
He was heard to mention your name several times
They were seen to leave the house early in the morning

6) After the expressions had better, would rather, would sooner, cannot but, nothing but, cannot choose but; need scarcely (only, hardly):
You had better go to bed.
I would rather not speak upon the subject.
I cannot but think so.
There was nothing left for him to do but watch and wait.