الْمَصْدَرُ

The أَسْمَاءُ الفِعْلِ / Infinitives also known as المَصْدَرُ / The place where a thing originates are abstract substantives ( A noun that accepts an adjective ) which express the action, passion or state indicated by the corresponding verb without any reference to object, subject and time.

Original (noun of action, infinitive, verbal noun)

There are 3 types of verbal nouns ( A noun formed from a verb but not serving as the verb of the sentence )

1) Infinitive, 2) Gerund and 3) Participle

1) Infinitive – It is a verb form having the characteristics of both verb (it expresses an action and can have an object) and noun (it can be the subject of a verb or an object and it may be governed by an adverb or a preposition) and usually begins with the word “To” followed by the base form of the present tense verb in the accusative case. It is called المَصْدَرُ المُؤَوَّلُ / Infinitive / Interpreted original

2) Gerund – It is a verb form having the characteristics of both verb (it expresses an action and can have an object) and noun (it can be the subject of a verb or an object and it may be governed by an adverb or a preposition) and always ends in “ing” followed by the base form of the present tense verb in the accusative case

3) Participles – Participles are adjectives derived from verbs. These verbal adjectives derived from the first form of the  trilateral verb have two principal forms namely فَاعِلٌ / Active participle and مَفْعُوْلٌ / Passive participle. There are other verbal adjectives derived from the first form of the verb called صِفَاتٌ مُشَبَّهَةُ بِأَسْمَاءِ الفَاعِلِ وَالمَفْعُوْلِ / Adjectives which are made like or are assimilated to the participles in respect of their inflection.

The أَسْمَاءُ الفِعْلِ / Infinitives also known as المَصْدَرُ are abstract nouns that accept adjectives and they express the action, passion, quality or state indicated by the corresponding verb without any reference to subject, object and time. They naturally accept adjectives and can also be used as adjectives

The above list of infinitive patterns cannot be formed from every trilateral verb, most admit one form, a few admit two or three forms.

The infinitives are used both in an active and a passive sense as قَتْلُهُ / his killing (another) or his being killed himself