In ‘normal inverted order’ clauses, the verb, or the first word of a verb longer than one word, precedes the subject: ‘Is John going’, ‘Does John go’, ‘Has John been going’. If the verb is just one word, normal inverted order occurs only with ‘be’, ‘have’, ‘can’, ‘could’, ‘may’, ‘might’, and a few others. The normal inverted parallel to ‘John can go’ is ‘can John go’; that of ‘John goes today’, however, is not ‘goes John today’ but ‘does John go today’.
- Hockett (1958), a pag.206-207

we are left with a set of fourteen: ‘pin’, ‘bin’, ‘tin’, ‘din’, ‘chin’, ‘gin’, ‘kin’, ‘fin’, ‘thin’, ‘sin’, ‘shin’, ‘Min’, ‘Lynn’, ‘win’. Each of these fourteen words begins with a single consonant sound, and each of the consonant sounds is different from each of the others. Thus, in place of a single two-way difference of sound (as in ‘pin’ and ‘bin’) what we have is a ‘network of interlocking differences of sound’.
- Hockett (1958), a pag.17