Tex. Gov't Code § 311.016 : GOVERNMENT CODE — LEGISLATIVE BRANCH — LEGISLATION — CODE CONSTRUCTION ACT — CONSTRUCTION OF WORDS AND PHRASES — "May," "Shall," "Must," Etc TEXT PDF The following constructions apply unless the context in which the word or phrase appears necessarily requires a different construction or unless a different construction is expressly provided by statute: (1) "May" creates discretionary authority or grants permission or a power. (2) "Shall" imposes a duty. (3) "Must" creates or recognizes a condition precedent. (4) "Is entitled to" creates or recognizes a right. (5) "May not" imposes a prohibition and is synonymous with "shall not." (6) "Is not entitled to" negates a right. (7) "Is not required to" negates a duty or condition precedent. Tex. Gov't. Code § 311.016 Added by Acts 1997, 75th Leg., ch. 220, Sec. 1, eff. 5/23/1997.