I. GENERAL RULES WITH THE DEFECTIVE VERBS ( can, must, may)
1- The defective verbs do not have ‘to' as an infinitive mark before the verb.
Exemple :
to speak
to eat
can
must
may
2-They are not followed by ‘to'
Exemple :
Ali wants to go to village,
Ali can go to village
3-They don't take ‘s' at the third person singular in the simple present
Exemple :
he eats
he goes
he can
he must
he may
4- They don't need do, does or did at the negative, interrogative and interro-negative forms
Exemple :
I do not speak
does she speak?
I cannot (can't)
can I ?
can we not?
5-They don't exist in all the tenses. In that case we replace them by their equivalents.
