1. Of that or this.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• thereoy,
• therorof,
• therfor,
• theorof,
• therei,
• thereoff,
• therioy,
• theree,
• theraoy,
• therea,
• therey,
• thoseof,
• thereofr,
• theroy,
• theroof,
• thereom,
• threoy,
• thereore,
• therow,
• therfeor

• thorpe,
• throb,
• Thorp,
• thereby,
• thurify,
• tharp,
• Thrope,
• throw off,
• thrip,
• throw up,
• throop,
• thrive,
• tharpe.

The adjective form of the word "thereof" is "thereof".

The plural form of the word "thereof" is "thereofs".

The singular form of the word "thereof" is "thereof". Unlike most words, "thereof" does not change its form to indicate singular or plural.