I can database you can database he can database we can database you can database they can database
V-ing form
I can be databasing you can be databasing he can be databasing we can be databasing you can be databasing they can be databasing
Perfect
I can have databased you can have databased he can have databased we can have databased you can have databased they can have databased
V-ing perfect
I can have been databasing you can have been databasing he can have been databasing we can have been databasing you can have been databasing they can have been databasing
Negation
Simple form
I can't database you can't database he can't database we can't database you can't database they can't database
V-ing form
I can't be databasing you can't be databasing he can't be databasing we can't be databasing you can't be databasing they can't be databasing
Perfect
I can't have databased you can't have databased he can't have databased we can't have databased you can't have databased they can't have databased
V-ing perfect
I can't have been databasing you can't have been databasing he can't have been databasing we can't have been databasing you can't have been databasing they can't have been databasing
Interrogative form
Simple form
can I database? can you database? can he database? can we database? can you database? can they database?
V-ing form
can I be databasing? can you be databasing? can he be databasing? can we be databasing? can you be databasing? can they be databasing?
Perfect
can I have databased? can you have databased? can he have databased? can we have databased? can you have databased? can they have databased?
V-ing perfect
can I have been databasing? can you have been databasing? can he have been databasing? can we have been databasing? can you have been databasing? can they have been databasing?
Interro-negative form
Simple form
can't I database? can't you database? can't he database? can't we database? can't you database? can't they database?
V-ing form
can't I be databasing? can't you be databasing? can't he be databasing? can't we be databasing? can't you be databasing? can't they be databasing?
Perfect
can't I have databased? can't you have databased? can't he have databased? can't we have databased? can't you have databased? can't they have databased?
V-ing perfect
can't I have been databasing? can't you have been databasing? can't he have been databasing? can't we have been databasing? can't you have been databasing? can't they have been databasing?