18. Supply pairs of words which can be distinguished by the following sets of sounds, e.g. for /p/ and /b/ post and boast.
Conditions d'achèvement
Sound Pair Word Pair /p/ & /b/ /t/ & /d/ /k/ & /g/ /f/ & /v/ /θ/ & /ð/ /s/ & /z/ /s/ & /θ/ /z/ & /ð/