An alternative to counterpart theory is to interpret terms for ordinary individuals as denoting (partial) functions from worlds to individuals, or aggregates of individuals at different worlds; a modal predication like ‘Biden might have been three-armed’ is then interpreted as saying that the function assigned to ‘Biden’ has a three-armed value for some world, or that the aggregate assigned to  ‘Biden’ has a three-armed part located in some world. A temporal analogue of this view (with aggregates) is Lewis’s preferred account of temporal discourse. In Lewis (1986f, 244) he endorses a similar view for events—but see Bernstein (2014), Kaiserman (2017), and McDonnell (2016) for reasons to prefer a counterpart-theoretic treatment.[9]