to enrich
An infinitive is the basic form of the verb without a subject. When it is used in a sentence, it is preceded by "to". The correct answer is the one with a verb. To test it out just ask yourself if you can use it with the subject I after dropping "to". I enrich? Yes! Check, it's right. You can't say I the delight or I Tuesday mornings. The rest of the options are prepositional phrases because they start with the preposition to and end in a noun (person, place, thing, or idea).
Many of the runners ____ incredibly fast.
The subject is "many" and many is plural.
Has would be wrong because you need a linking verb (the predicate is an adjective)
"Is" would be wrong because the subject is plural and "is" corresponds to a singular subject.
"Was" is incorrect because "was" corresponds to a singular noun.
Therefore "are" would be correct because it is a linking verb that corresponds to a plural noun.
Hush crawl shout crack creep yell dart roar sleep bark still snail zoom dash pease lull flee calm jump lag swift
