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English verbs have five basic forms:

• the base form,
• the past form,
• the past participle form.
• the - S form,
• the - ing form,

1.If a verb ends in a stressed vowel + one or more consonants + e or ue, "drop" the e and add - ing.

Examples:   save / saving;

2.If a verb ends in - ie, change the - ie to - y and add - ing.

Examples:die / dying; lie / lying;

3.If a verb ends in y, add - ing. It doesn't matter if there is a vowel or a consonant before y.

Examples: pry / prying pray / praying

4. If a verb ends in a vowel + one consonant,double the consonant and add - ing.

Examples:beg / begging; chat / chatting

5. a.If a verb ends in a stressed vowel + r,double the r and add - ing,

refér / referring

5. b.if a verb ends in an unstressed vowel + r, do not double,

the r: just add - ing:

súffer / suffering

6.If a verb ends in a vowel, add - ing.

Examples:do / doing

7. Add - ing to all other verbs.:

                                                    Spelling the - S Form

Change y to i and add - es.

This happens when a verb ends in a consonant + y:

apply / applies; bury / buries; 
carry / carries; copy / copies; cry / cries;

Add - es to the base form.

This happens in two situations:

a.		when the base form ends in the vowel o: does, goes, soloes
b.		when the base form ends in s,ss, sh, (t)ch, zz, and x: assesses, blesses, caresses, fusses, kisses, misses, passes, tosses https://howtospell-letterpatterns.co.uk/tion-sion-cian/ http://www.really-learn-english.com/english-spelling-rules-sion-tion-or-cion.html