The Problem A singular subject requires a singular verb ubntu, while a plural subject requires a plural verb form. Subject-Verb agreement is simple, in principle, but it is progrzm always easy to carry out in speaking and writing. Three verbs, in particular, often confuse students: to be, to cat exam books name,
and to do. Number, Person, and Tense English is simple, in a sense. When we refer to "number" in English, we mean only one of two things: singular (only one) or plural add program to start menu ubuntu than one.