Final Consonant Sequence - Consonant + /s, z, t, d/
Why do we have so many sequences of the consonant followed by /s/ or /z/?
Because of the way in which regular plurals are formed in English (i.e. by adding the letter –s or -es ; the phonemes /s/ or /z/ to the words to make plural form).
Why do we have so many sequences of a consonant followed by /d/ or /t/?
Because of the way in which regular past tenses are formed in English i.e. by adding the letters –ed ; the phonemes /d/ or /t/ to the words to make the past form.
Examples of such sequences:
Cups /k^ps/ cats /k?ts/
Weeks /wi:ks/ laughs /la:fs/
Jobs /d?bz/ goods /gudz/
Dams /d?mz/ turns /t?:nz/
Eggs /egz/ drives /draivz/
Songs /so?z/ wells /welz/
Laughed /la:ft/ missed /m?ist/
Washed /wo?t/ watched /wot?t/
Proved /pru:vd/ breathed /bri:?d/
Seemed /si:md/ owned /?und/
Gazed /geizd/ judged /d?^d?d/
Banged /b??d/ filled /fild/
Note seven of these sequences /ps/ , /ks/, /nz/ , /ft/ , /st/, /nd/, and /ld/ occur in word which are not plural or past forms; so we may add to them /s/ , /z/ , /t/ or /d / to make past or plural forms, for example fixed /fikst/ or guests /gests/.
Also we have the word sixth /siks?/ when /?/ is added to /ks/.