die => dy + ing => dying
So these were the spelling rules for adding "ing".
2 - Spelling Rules for Adding "s"
Introduction
Vowel = a sound we make when the breath flows out through the mouth freely, without being
blocked. The English letters a, e, i, o, u are called vowels, because they represent such sounds.
Consonant = a sound we make that is not a vowel. The breath is somehow blocked on its way
out of the mouth. For example, the sound b is made when breath flow is stopped with the lips.
All the other English letters which are not vowels are called consonants. These
are: b, c, d, f, g, h, j, k, l, m, n, p, q, r,s, t, v, w, x, y, z.
Some verbs change their spelling when the letter "s" is added to them.
Verbs Ending with "s", "ch", "sh", "x" or "z"
When a verb ends with s, ch, sh, x or z, we add the letter e, and then we add the letter s.
In the following examples the part before the letter s is in purple, and the letters es are in red.
miss => miss + es => misses
kiss => kiss + es => kisses
watch => watch + es => watches
teach => teach + es => teaches
wash => wash + es => washes
push => push + es => pushes
mix => mix + es => mixes
fix => fix + es => fixes
buzz => buzz + es => buzzes