I can drink you can drink he can drink we can drink you can drink they can drink
V-ing form
I can be drinking you can be drinking he can be drinking we can be drinking you can be drinking they can be drinking
Perfect
I can have drunk you can have drunk he can have drunk we can have drunk you can have drunk they can have drunk
V-ing perfect
I can have been drinking you can have been drinking he can have been drinking we can have been drinking you can have been drinking they can have been drinking
Negation
Simple form
I can't drink you can't drink he can't drink we can't drink you can't drink they can't drink
V-ing form
I can't be drinking you can't be drinking he can't be drinking we can't be drinking you can't be drinking they can't be drinking
Perfect
I can't have drunk you can't have drunk he can't have drunk we can't have drunk you can't have drunk they can't have drunk
V-ing perfect
I can't have been drinking you can't have been drinking he can't have been drinking we can't have been drinking you can't have been drinking they can't have been drinking
Interrogative form
Simple form
can I drink? can you drink? can he drink? can we drink? can you drink? can they drink?
V-ing form
can I be drinking? can you be drinking? can he be drinking? can we be drinking? can you be drinking? can they be drinking?
Perfect
can I have drunk? can you have drunk? can he have drunk? can we have drunk? can you have drunk? can they have drunk?
V-ing perfect
can I have been drinking? can you have been drinking? can he have been drinking? can we have been drinking? can you have been drinking? can they have been drinking?
Interro-negative form
Simple form
can't I drink? can't you drink? can't he drink? can't we drink? can't you drink? can't they drink?
V-ing form
can't I be drinking? can't you be drinking? can't he be drinking? can't we be drinking? can't you be drinking? can't they be drinking?
Perfect
can't I have drunk? can't you have drunk? can't he have drunk? can't we have drunk? can't you have drunk? can't they have drunk?
V-ing perfect
can't I have been drinking? can't you have been drinking? can't he have been drinking? can't we have been drinking? can't you have been drinking? can't they have been drinking?