I can leister you can leister she can leister we can leister you can leister they can leister
V-ing form
I can be leistering you can be leistering she can be leistering we can be leistering you can be leistering they can be leistering
Perfect
I can have leistered you can have leistered she 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 she can have been leistering we can have been leistering you can have been leistering they can have been leistering
Negation
Simple form
I cannot leister you cannot leister she cannot leister we cannot leister you cannot leister they cannot leister
V-ing form
I cannot be leistering you cannot be leistering she cannot be leistering we cannot be leistering you cannot be leistering they cannot be leistering
Perfect
I cannot have leistered you cannot have leistered she cannot have leistered we cannot have leistered you cannot have leistered they cannot have leistered
V-ing perfect
I cannot have been leistering you cannot have been leistering she cannot have been leistering we cannot have been leistering you cannot have been leistering they cannot have been leistering
Interrogative form
Simple form
can I leister? can you leister? can she leister? can we leister? can you leister? can they leister?
V-ing form
can I be leistering? can you be leistering? can she be leistering? can we be leistering? can you be leistering? can they be leistering?
Perfect
can I have leistered? can you have leistered? can she 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 she have been leistering? can we have been leistering? can you have been leistering? can they have been leistering?
Interro-negative form
Simple form
can I not leister? can you not leister? can she not leister? can we not leister? can you not leister? can they not leister?
V-ing form
can I not be leistering? can you not be leistering? can she not be leistering? can we not be leistering? can you not be leistering? can they not be leistering?
Perfect
can I not have leistered? can you not have leistered? can she not have leistered? can we not have leistered? can you not have leistered? can they not have leistered?
V-ing perfect
can I not have been leistering? can you not have been leistering? can she not have been leistering? can we not have been leistering? can you not have been leistering? can they not have been leistering?