I can double-check you can double-check he can double-check we can double-check you can double-check they can double-check
V-ing form
I can be double-checking you can be double-checking he can be double-checking we can be double-checking you can be double-checking they can be double-checking
Perfect
I can have double-checked you can have double-checked he can have double-checked we can have double-checked you can have double-checked they can have double-checked
V-ing perfect
I can have been double-checking you can have been double-checking he can have been double-checking we can have been double-checking you can have been double-checking they can have been double-checking
Negation
Simple form
I can't double-check you can't double-check he can't double-check we can't double-check you can't double-check they can't double-check
V-ing form
I can't be double-checking you can't be double-checking he can't be double-checking we can't be double-checking you can't be double-checking they can't be double-checking
Perfect
I can't have double-checked you can't have double-checked he can't have double-checked we can't have double-checked you can't have double-checked they can't have double-checked
V-ing perfect
I can't have been double-checking you can't have been double-checking he can't have been double-checking we can't have been double-checking you can't have been double-checking they can't have been double-checking
Interrogative form
Simple form
can I double-check? can you double-check? can he double-check? can we double-check? can you double-check? can they double-check?
V-ing form
can I be double-checking? can you be double-checking? can he be double-checking? can we be double-checking? can you be double-checking? can they be double-checking?
Perfect
can I have double-checked? can you have double-checked? can he have double-checked? can we have double-checked? can you have double-checked? can they have double-checked?
V-ing perfect
can I have been double-checking? can you have been double-checking? can he have been double-checking? can we have been double-checking? can you have been double-checking? can they have been double-checking?
Interro-negative form
Simple form
can't I double-check? can't you double-check? can't he double-check? can't we double-check? can't you double-check? can't they double-check?
V-ing form
can't I be double-checking? can't you be double-checking? can't he be double-checking? can't we be double-checking? can't you be double-checking? can't they be double-checking?
Perfect
can't I have double-checked? can't you have double-checked? can't he have double-checked? can't we have double-checked? can't you have double-checked? can't they have double-checked?
V-ing perfect
can't I have been double-checking? can't you have been double-checking? can't he have been double-checking? can't we have been double-checking? can't you have been double-checking? can't they have been double-checking?