what is PRIMARY HELPING VERBS and MODAL HELPING VERB? Asked by sreya mohan on 27/06/12
All helping verbs are used with a main verb (either expressed or understood by default). There are 2 groups of helping verbs:
Primary helping verbs usually changes the tense or voice of the main verb and is also used in making questions and negations.
Instances of the same are:
do + V1 (base verb)
be + -ing (present participle)
have + V3 (past participle)
Modal helping verbs which are usually used to change the 'mood' of the main verb.
Instances of the same can be understood in the mentioned link below: