Adjectives Complemented by Infinitive Verb as modifier for THINGS [Hindi1 is useful to know2. = It1 is useful to know Hindi2. = Knowing Hindi1 is useful2.= To know Hindi1 is useful2. All of these sentences are with linking verb ‘is’ with a subject1 and subject complement2, The subject complement is either a predicate adjective without any complement or a predicate adjective phrase with a complement which is to-infinitive verb phrase. 2nd point to note is that the infinitive verb is transitive but not a causative action verb (like: make, force, help, get). 3rdly object of the verb ‘know’ that is ‘’Hindi’ becomes subject in alternate sentence construction. 4th noteworthy characteristic of the adjective ‘useful’ is that the subject is not an ‘agentive volitional actor’ since the verb is not a causative action verb, which is the reason why ‘It’ can be a dummy subject. All these adjectives can take ‘for’ after it before ‘to’- verb. The luggage is heavy (for me/you) to lift. The explanation is easy (for any one) to understand. All these adjectives also allow sentence construction with ‘It’ as subject. It is heavy to lift the luggage. It is easy to understand the explanation. Corresponding noun of these adjectives do not take ‘to’ preposition. It is important to take Vitamin D course for prevention against Covid. > Importance of taking Vitamin D for prevention against Covid is well known by now.
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