5.8 Pronouns 117 3. `that', `if', and `whether' can be used after a verb that states or questions the truth of a proposition, such as `state', `ask', `question', or `check', as described in Section 5.3.5; 4. `other than' may be used to introduce a qualifying clause, "a payment other than a cash payment". Conjunctions may also be used in compound nouns, as described in Section 5.1.2. 5.8 PRONOUNS Pronouns are words that may stand in place of nouns (or other pronouns) previously referred to: for example, `him' as in "when Paul arrived, we recognized him". The following classes of pronouns are relevant to rule statements: 1. the personal pronouns: these include `he', `him', `she', `her', `it', `they', and `them', but only `it' is generally used in rule statements; 2. the relative pronouns (including `that', `who', `which', `whom', and `whose'), which act as the subject or object of the first or only verb in a relative clause (see Section 7.2.7 in Chapter 7), as in the following examples: a. in "the house that Jack built", `that' referring to `house', is the object of `built' in the relative clause "that Jack built",