I can duplicate you can duplicate he can duplicate we can duplicate you can duplicate they can duplicate
V-ing form
I can be duplicating you can be duplicating he can be duplicating we can be duplicating you can be duplicating they can be duplicating
Perfect
I can have duplicated you can have duplicated he can have duplicated we can have duplicated you can have duplicated they can have duplicated
V-ing perfect
I can have been duplicating you can have been duplicating he can have been duplicating we can have been duplicating you can have been duplicating they can have been duplicating
Negation
Simple form
I can't duplicate you can't duplicate he can't duplicate we can't duplicate you can't duplicate they can't duplicate
V-ing form
I can't be duplicating you can't be duplicating he can't be duplicating we can't be duplicating you can't be duplicating they can't be duplicating
Perfect
I can't have duplicated you can't have duplicated he can't have duplicated we can't have duplicated you can't have duplicated they can't have duplicated
V-ing perfect
I can't have been duplicating you can't have been duplicating he can't have been duplicating we can't have been duplicating you can't have been duplicating they can't have been duplicating
Interrogative form
Simple form
can I duplicate? can you duplicate? can he duplicate? can we duplicate? can you duplicate? can they duplicate?
V-ing form
can I be duplicating? can you be duplicating? can he be duplicating? can we be duplicating? can you be duplicating? can they be duplicating?
Perfect
can I have duplicated? can you have duplicated? can he have duplicated? can we have duplicated? can you have duplicated? can they have duplicated?
V-ing perfect
can I have been duplicating? can you have been duplicating? can he have been duplicating? can we have been duplicating? can you have been duplicating? can they have been duplicating?
Interro-negative form
Simple form
can't I duplicate? can't you duplicate? can't he duplicate? can't we duplicate? can't you duplicate? can't they duplicate?
V-ing form
can't I be duplicating? can't you be duplicating? can't he be duplicating? can't we be duplicating? can't you be duplicating? can't they be duplicating?
Perfect
can't I have duplicated? can't you have duplicated? can't he have duplicated? can't we have duplicated? can't you have duplicated? can't they have duplicated?
V-ing perfect
can't I have been duplicating? can't you have been duplicating? can't he have been duplicating? can't we have been duplicating? can't you have been duplicating? can't they have been duplicating?