I can double-check you can double-check she 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 she 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 she 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 she 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 cannot double-check you cannot double-check she cannot double-check we cannot double-check you cannot double-check they cannot double-check
V-ing form
I cannot be double-checking you cannot be double-checking she cannot be double-checking we cannot be double-checking you cannot be double-checking they cannot be double-checking
Perfect
I cannot have double-checked you cannot have double-checked she cannot have double-checked we cannot have double-checked you cannot have double-checked they cannot have double-checked
V-ing perfect
I cannot have been double-checking you cannot have been double-checking she cannot have been double-checking we cannot have been double-checking you cannot have been double-checking they cannot have been double-checking
Interrogative form
Simple form
can I double-check? can you double-check? can she 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 she 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 she 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 she 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 I not double-check? can you not double-check? can she not double-check? can we not double-check? can you not double-check? can they not double-check?
V-ing form
can I not be double-checking? can you not be double-checking? can she not be double-checking? can we not be double-checking? can you not be double-checking? can they not be double-checking?
Perfect
can I not have double-checked? can you not have double-checked? can she not have double-checked? can we not have double-checked? can you not have double-checked? can they not have double-checked?
V-ing perfect
can I not have been double-checking? can you not have been double-checking? can she not have been double-checking? can we not have been double-checking? can you not have been double-checking? can they not have been double-checking?