Verbals, Verbal Phrase, Finite and Non-finite verbs

Verbals are verb forms working as another parts of speech. Verbals are words that seem to convey the idea of action or being but do not work as a true verb. They are sometimes called “non-finite” (unfinished or incomplete) verbs. They do not function as a verb but as a noun (as a subject or an object) or a modifier (adverbial or adjectival). They do not function as a predicate. There are various verbal forms: Infinitives, Gerunds, and Participle.
Verbal Phrase.
When other related words are used with verbals , it is called Verbal Phrase.
Finite and Non-finite verbs
Finite means limited. Verbs which are limited in their number and person by their subject are called Finite. Verbs which are not limited in their number and person by the subject are non-finite (infinite). Infinite do not express tense of the verb. They simply name the action. Non-finite verbs are not affected  by tense changes. In other words the verbs which have the past or the present form are called Finite Verbs. Verbs in any other form (infinitive,-ing, or,-ed) are called Non-finite Verbs. This means that verbs with tense are Finite, and verbs without tense are Non-finite. Another, more useful term for non-finite verb is Verbals.
He runs. (present, finite)
John plays the piano. (present, finite)
He spoke English. (past, finite)
Children love to sing. (infinitive, nonfinite)
Running fast is a good exercise. (-ing form, nonfinite)
Leave immediately when you are asked. (-ed form, nonfinite)
He refused to obey the orders. (infinitive)
We need not do it. (infinitive)
A lost opportunity never retuns. (participle)
I like reading poetry. (Gerund)
Seeing is believing. (Gerund)
He played a losing game. (participle)
Having rested, we worked hard. (participle)