Use this (maybe in your .emacs) and you can transpose sentences with only 1 space: (setq sentence-end-double-space nil) (setq sentence-end "[.?!][]\"')]\\($\\|

Use this (maybe in your .emacs) and you can transpose sentences with only 1 space: (setq sentence-end-double-space nil) (setq sentence-end "[.?!][]\"')]\\($\\|\t\\| \\)[ \t\n]")