MODAL VERBS
DEFINICIÓN: Modal auxiliary verbs are invariable (no conjugation, no 3rd person -s).
And the main verb is always the "bare infinitive" (the infinitive without "to"). Except
for ought to,need to .and have to.
They are incomplete as they do not have infinite or past participle. They do not need of
an auxiliary except for need to/ have/has to that use the auxiliaries: do /does; did or
will in negative and interrogative sentences .
WORD ORDER
1. In affirmative sentences the order is:
Subject + modal + main verb
They -can come.
Mike-should walk.
2. In negative sentences the order is:
Subject+modal+not+main verb
That can’t be true
He shouldn’t go to work if he is ill.
3. In interrogative sentences the order is:
a. Yes/No questions
Modal + subject + main verb?
Can-they-come?
Should-Mike drive?
b.Wh- questions
Wh- word + modal subject + main verb?
When can they-come?
How-could he-know that?
