May
A month which promises much but so often disappoints. A prime minister who did likewise. A modal verb which , in the argot of a lawyer, expresses optionality, but is written “shall be entitled”.
See also
Plain English Anatomy™ Noun | Verb | Adjective | Adverb | Preposition | Conjunction | Latin | Germany | Flannel | Legal triplicate | Nominalisation | Murder your darlings