Question

v) I was warned ________
going out at night.
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Answer 1

Answer:

I was warned for going out at night

Answer 2

I was warned ____of____going out at night.

• the word of in the above sentence is a preposition
• preposition is a word that precede a noun or a pronoun and establish a relation with another word or phrase.
• the relation generally is about time ,place or direction.
• without preposition , a sentence generally does not establish a meaning.
• the preposition in tha above sentence "of" establish a relation between the pronoun I and phrase going out at night.