As with the noun forms, the number indicates whether it refers to one or more persons or things. The number of verb forms in both Dutch and Greek corresponds to the number of the associated subject or - in the case of a imperative - the associated person addressed. In Greek, however, a plural subject of neuter gender can be combined with a singular verb form.
In the following example from Heb. 2:14, the verb in the Greek is in the singular:
Since now the children (onz. mv) partake of blood and flesh (ev), ...
See further at grammar.