I can leister you can leister he can leister we can leister you can leister they can leister
V-ing form
I can be leistering you can be leistering he can be leistering we can be leistering you can be leistering they can be leistering
Perfect
I can have leistered you can have leistered he can have leistered we can have leistered you can have leistered they can have leistered
V-ing perfect
I can have been leistering you can have been leistering he can have been leistering we can have been leistering you can have been leistering they can have been leistering
Negation
Simple form
I can't leister you can't leister he can't leister we can't leister you can't leister they can't leister
V-ing form
I can't be leistering you can't be leistering he can't be leistering we can't be leistering you can't be leistering they can't be leistering
Perfect
I can't have leistered you can't have leistered he can't have leistered we can't have leistered you can't have leistered they can't have leistered
V-ing perfect
I can't have been leistering you can't have been leistering he can't have been leistering we can't have been leistering you can't have been leistering they can't have been leistering
Interrogative form
Simple form
can I leister? can you leister? can he leister? can we leister? can you leister? can they leister?
V-ing form
can I be leistering? can you be leistering? can he be leistering? can we be leistering? can you be leistering? can they be leistering?
Perfect
can I have leistered? can you have leistered? can he have leistered? can we have leistered? can you have leistered? can they have leistered?
V-ing perfect
can I have been leistering? can you have been leistering? can he have been leistering? can we have been leistering? can you have been leistering? can they have been leistering?
Interro-negative form
Simple form
can't I leister? can't you leister? can't he leister? can't we leister? can't you leister? can't they leister?
V-ing form
can't I be leistering? can't you be leistering? can't he be leistering? can't we be leistering? can't you be leistering? can't they be leistering?
Perfect
can't I have leistered? can't you have leistered? can't he have leistered? can't we have leistered? can't you have leistered? can't they have leistered?
V-ing perfect
can't I have been leistering? can't you have been leistering? can't he have been leistering? can't we have been leistering? can't you have been leistering? can't they have been leistering?