Estates as to their quantity are first divided into freeholds and less than freeholds. Freeholds are subdivided into estates of inheritance and freeholds less than inheritance. Freeholds of inheritance include estates of fee-simple and fee-tail. Freeholds less than inheritance include the various kinds of life estates. Estates less than inheritance are subdivided into estates for years, estates at will, estates from year to year and estates at sufferance.1