# list for use in FUNCTION present_participle(lst):
not_stressed_syllable = ['listen', 'happen', 'orbit', 'consider', 'discover', 
'budget', 'benefit', 'counsel', 'marvel', 'offer',
'open', 'quarrel', 'ripen', 'visit', 'vomit',
'worship', 'debut', 'exit', 'enter', 'signal', 'remain',
'rain', 'ruin', 'seat', 'fool']

# dictionary for use in FUNCTION third_person_singular(lst):
irregular_third_person = {'quiz': 'quizzes', 
                          'go': 'goes', 
                          'do': 'does',
                          'have': 'has',
                          'be': 'is'}

# modal verbs dictionary
modal_verbs_singular = {'can': 'can',
                    'must': 'must',
                    'should': 'should',
                    'may': 'may',
                    'might': 'might',
                    'would': 'would',
                    'will': 'will',
                    'shall': 'shall',
                    'could': 'could'}

# modal verbs present-preterite pairs
modal_verbs_preterite = {'can': 'could',
                    'must': '----',
                    'may': 'might',
                    'will': 'would',
                    'shall': 'should',
                    'should': 'should',
                    'might': 'might',
                    'would': 'would',
                    'could': 'could',
                    'need': 'needed'}
