Compound subjects joined by and will take a plural verb. Subjects joined by or or nor will take the verb that agrees with the subject closer to it. Her friends and she like ice cream. Neither her friends nor she likes brussels sprouts. If you use a singular verb, use a singular pronoun.
Relative pronouns take verbs which agree with the pronouns' antecedents.
Tell me about the woman who comes with you on Thursday. Here are the pages that tell the answers. Jim always gives me candy, which makes me fat. This is the only one of those stories that makes me cry.