I can clear you can clear he can clear we can clear you can clear they can clear
V-ing form
I can be clearing you can be clearing he can be clearing we can be clearing you can be clearing they can be clearing
Perfect
I can have cleared you can have cleared he can have cleared we can have cleared you can have cleared they can have cleared
V-ing perfect
I can have been clearing you can have been clearing he can have been clearing we can have been clearing you can have been clearing they can have been clearing
Negation
Simple form
I cannot clear you cannot clear he cannot clear we cannot clear you cannot clear they cannot clear
V-ing form
I cannot be clearing you cannot be clearing he cannot be clearing we cannot be clearing you cannot be clearing they cannot be clearing
Perfect
I cannot have cleared you cannot have cleared he cannot have cleared we cannot have cleared you cannot have cleared they cannot have cleared
V-ing perfect
I cannot have been clearing you cannot have been clearing he cannot have been clearing we cannot have been clearing you cannot have been clearing they cannot have been clearing
Interrogative form
Simple form
can I clear? can you clear? can he clear? can we clear? can you clear? can they clear?
V-ing form
can I be clearing? can you be clearing? can he be clearing? can we be clearing? can you be clearing? can they be clearing?
Perfect
can I have cleared? can you have cleared? can he have cleared? can we have cleared? can you have cleared? can they have cleared?
V-ing perfect
can I have been clearing? can you have been clearing? can he have been clearing? can we have been clearing? can you have been clearing? can they have been clearing?
Interro-negative form
Simple form
can I not clear? can you not clear? can he not clear? can we not clear? can you not clear? can they not clear?
V-ing form
can I not be clearing? can you not be clearing? can he not be clearing? can we not be clearing? can you not be clearing? can they not be clearing?
Perfect
can I not have cleared? can you not have cleared? can he not have cleared? can we not have cleared? can you not have cleared? can they not have cleared?
V-ing perfect
can I not have been clearing? can you not have been clearing? can he not have been clearing? can we not have been clearing? can you not have been clearing? can they not have been clearing?