Verb Rules Grammar

A.2.3 Verb Rules
We make the present continuous tense by adding -ing to the base verb. Normally it's simple - we just add -ing. But sometimes we have to change the word a little. Perhaps we double the last letter, or we drop a letter. Here are the rules to help you know how to spell the present continuous tense.

Basic rule	Just add -ing to the base verb:
	Work	>	working
	Play	>	playing
	Assist	>	assisting
	See	>	seeing
	Be	>	being
Exception 1	If the base verb ends in consonant + stressed vowel + consonant, double the last letter: s T o p Consonant stressed vowel consonant (vowels = a, e, i, o, u)
	Stop	>	stopping
	Run	>	running
	Begin	>	beginning
	Note that this exception does not apply when the last syllable of the base verb is not stressed:
	Open	>	opening
Exception 2	If the base verb ends in ie, change the ie to y:
	Lie	>	lying
	Die	>	dying
Exception 3	If the base verb ends in vowel + consonant + e, omit the e:
	Come	>	coming
	mistake	>	mistaking