I can clarify you can clarify he can clarify we can clarify you can clarify they can clarify
V-ing form
I can be clarifying you can be clarifying he can be clarifying we can be clarifying you can be clarifying they can be clarifying
Perfect
I can have clarified you can have clarified he can have clarified we can have clarified you can have clarified they can have clarified
V-ing perfect
I can have been clarifying you can have been clarifying he can have been clarifying we can have been clarifying you can have been clarifying they can have been clarifying
Negation
Simple form
I cannot clarify you cannot clarify he cannot clarify we cannot clarify you cannot clarify they cannot clarify
V-ing form
I cannot be clarifying you cannot be clarifying he cannot be clarifying we cannot be clarifying you cannot be clarifying they cannot be clarifying
Perfect
I cannot have clarified you cannot have clarified he cannot have clarified we cannot have clarified you cannot have clarified they cannot have clarified
V-ing perfect
I cannot have been clarifying you cannot have been clarifying he cannot have been clarifying we cannot have been clarifying you cannot have been clarifying they cannot have been clarifying
Interrogative form
Simple form
can I clarify? can you clarify? can he clarify? can we clarify? can you clarify? can they clarify?
V-ing form
can I be clarifying? can you be clarifying? can he be clarifying? can we be clarifying? can you be clarifying? can they be clarifying?
Perfect
can I have clarified? can you have clarified? can he have clarified? can we have clarified? can you have clarified? can they have clarified?
V-ing perfect
can I have been clarifying? can you have been clarifying? can he have been clarifying? can we have been clarifying? can you have been clarifying? can they have been clarifying?
Interro-negative form
Simple form
can I not clarify? can you not clarify? can he not clarify? can we not clarify? can you not clarify? can they not clarify?
V-ing form
can I not be clarifying? can you not be clarifying? can he not be clarifying? can we not be clarifying? can you not be clarifying? can they not be clarifying?
Perfect
can I not have clarified? can you not have clarified? can he not have clarified? can we not have clarified? can you not have clarified? can they not have clarified?
V-ing perfect
can I not have been clarifying? can you not have been clarifying? can he not have been clarifying? can we not have been clarifying? can you not have been clarifying? can they not have been clarifying?