Non-finite verbs:
Non-finite verbs do not show tense, person and number. The verb “come” in the following sentences is an example of a non-finite verb.
e.g. I expect him to come soon. We expect them to come soon. (person and number)
He is coming now. He was coming at the same time yesterday. (tense)
Non-finite verbs can have three forms:
1. The infinitive
The infinitive has the same form as the base. It is often preceded by an infinitive marker “to”.
In some cases (e.g. after modal auxiliary verbs) the infinitive is bare (without “to”).
For example: I am waiting for him to come. (Infinitive with “to”)
He can come tomorrow. (Bare Infinitive)
2. Present Participle (also called –ing participle)
e.g. walking, talking, drinking, speaking
3. Past Participle (also called –ed participle)
e.g. walked, talked, drunk, spoken