Halliday & Matthiessen (2014: 474):
There is no finite form for replacement. For subtraction the finite clause is introduced by except that, but (for the fact) that; e.g.||| Camera pulls back to show Kane and Susan in much the same positions as before, || except that they are older. |||
||| Language began || when interjections ended || but that man still utters cries and uses interjections || and that their significance is merely affective, i.e., expressing fear, surprise, etc. |||