adj:不可能存在(或做到的事),不可能的,很难对付的
n:(似乎)不可能完成的任务
复数 impossibles
例句:It is impossible for me to be here before eight.
It was impossible to make assumptions about people's reactions
词根记忆 im(反义)+possible
近义词 inconceivable(不可思议的)
固定句式 It is impossible for sb to do sth