... participles or infinitive to form ordinary verbs, they are not added to the meaning of the main verbs But when they stand alone, they are the meaningful verbs The auxiliary verbs affect the form of the ... playing in the garden again 30 The difference between infinitive and ing form is that infinitive form is used for things that happen(ed) and the other one is for things that are/were happening ... II: the primary auxiliary verbs in ENGLISH 2.1 Definition: The primary auxiliary verbs or the principal auxiliaries are verbs that take the first importance of the auxiliaries, they are combined...