The police have found their suspect. The jury has delivered its verdict. The company is going to expand its operations. If you are not sure whether to make the collective word singular or plural add the word members of before the collective noun and make references to that plural. For example, if you are not sure whether a group expression like the college board is singular or plural, use instead the expression members of the college board , an expression which is clearly plural.
Some pronouns change their form, depending on whether they are subjects, objects, or possessives.
I gave our books to him and to her. There is the man whose father has just died. When the pronoun is the subject of the dependent clause or the question, use who . When the pronoun is an object of the verb or a preposition, use whom . And when the pronoun is a possessive, use whose .