I can ossify you can ossify he can ossify we can ossify you can ossify they can ossify
V-ing form
I can be ossifying you can be ossifying he can be ossifying we can be ossifying you can be ossifying they can be ossifying
Perfect
I can have ossified you can have ossified he can have ossified we can have ossified you can have ossified they can have ossified
V-ing perfect
I can have been ossifying you can have been ossifying he can have been ossifying we can have been ossifying you can have been ossifying they can have been ossifying
Negation
Simple form
I can't ossify you can't ossify he can't ossify we can't ossify you can't ossify they can't ossify
V-ing form
I can't be ossifying you can't be ossifying he can't be ossifying we can't be ossifying you can't be ossifying they can't be ossifying
Perfect
I can't have ossified you can't have ossified he can't have ossified we can't have ossified you can't have ossified they can't have ossified
V-ing perfect
I can't have been ossifying you can't have been ossifying he can't have been ossifying we can't have been ossifying you can't have been ossifying they can't have been ossifying
Interrogative form
Simple form
can I ossify? can you ossify? can he ossify? can we ossify? can you ossify? can they ossify?
V-ing form
can I be ossifying? can you be ossifying? can he be ossifying? can we be ossifying? can you be ossifying? can they be ossifying?
Perfect
can I have ossified? can you have ossified? can he have ossified? can we have ossified? can you have ossified? can they have ossified?
V-ing perfect
can I have been ossifying? can you have been ossifying? can he have been ossifying? can we have been ossifying? can you have been ossifying? can they have been ossifying?
Interro-negative form
Simple form
can't I ossify? can't you ossify? can't he ossify? can't we ossify? can't you ossify? can't they ossify?
V-ing form
can't I be ossifying? can't you be ossifying? can't he be ossifying? can't we be ossifying? can't you be ossifying? can't they be ossifying?
Perfect
can't I have ossified? can't you have ossified? can't he have ossified? can't we have ossified? can't you have ossified? can't they have ossified?
V-ing perfect
can't I have been ossifying? can't you have been ossifying? can't he have been ossifying? can't we have been ossifying? can't you have been ossifying? can't they have been ossifying?