Wh words 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