§ 152.009 RULES APPLYING TO THE TEXT.
   For the purpose of this chapter certain rules of construction apply to the text, as follows:
   (A)   Words used in the present tense include the future tense; and the singular includes the plural, unless the context clearly indicates the contrary.
   (B)   The term SHALL is always mandatory and not discretionary; the word MAY or SHOULD is permissive.
   (C)   Any word or term not interpreted or defined by this section or § 152.010 shall be used with a meaning of common or standard utilization.
(1984 Code, § 5.511)