1) used with the present participle of another verb to form the continuous tenses (be)
2) (used with the past participle of another verb (e.g. moved, done) to form) a: the present perfect tense, b: the past perfect tense, c: the future perfect tense, d: the perfect conditional tense (have)
the '-ing' form of a verb when used as a noun, as in 'fond of swimming'
action word
(of) the form of a verb used with or without 'to', e.g. 'let him go', 'allow hot to go'
action word
to have a share, be involved (in something)
action word
a word showing the performance or occurrence of an action, the existence of a state or condition etc; as in 'I laugh'
action word
