If the underlined phrase is <em>having been warned by her mother, </em>then this is a nonessential perfect participial phrase.
Nonessential phrases are separated from the rest of the sentence by commas, and since this is a perfect participle, this is the only correct option.
Warm day
Ravens eating corn dogs in
The back of a truck
Goodis correct because it modifies the noun chances-Good chances
Hi !!
The correct subject-verb agreement is ===>
A- Several of the workers <u>are</u> on their luch break.
The indefinite pronouns as <em>both, many, few, others, several </em>are plural
hope this helps ☺☺☺
