2.1. Subject + have/has + been + infinitive + -ing
3. simple
3.1. base form of the infinitive we add 'S' in the third person
3.2. For verbs that end in -O, -CH, -SH, -SS, -X, or -Z we add -ES in the third person.
3.3. For verbs that end in a consonant + Y, we remove the Y and add -IES NOTE: For verbs that end in a vowel + Y, we just add -S
4. progressive
4.1. Sub+ verb+ ing
4.2. When the verb ends with a silent E, drop the e and add -ing (Make/Making) But: ee at the end of the word is not changed (Agree/Agreeing)
4.3. For short, one-syllable verbs, that end with consonant + vowel + consonant. we must double the last consonant and then add -ing (Swim/swimming) words that end w, x and y, do not double the last consonant; just add -ing(enjoy/enjoying)
4.4. When words have two or more syllables that end with consonant + vowel + consonant. you must double the last consonant if the last syllable is stressed. + ing (commit/committing) When the last syllable is not stressed, just add -ing. (whisper / whispering)
4.5. For verbs that end in –ie, change the ie to y before adding ing (die/dying)
