1 If the stem of the yo form is exactly the same as the stem of the infinitive, the verb is regular; use this stem and attach the appropriate endings [the endings for the subjunctive are for the most part the opposite conjugation endings of the present indicative].
Inc (Incorporated) and Corp (Corporation or Corporated) are both shorthands for a certain business entity - a Corporation. An LLC is also an abbreviation for a business entity - a Limited Liability Company.
A LLC, or limited liability company, is an unincorporated business. Owners are known as members and in most states can include individuals, corporations, other LLCs and foreign entities. A PLC, or public liability company, is a well known incorporated company that can sell ownership shares to the public.