I can callus you can callus he can callus we can callus you can callus they can callus
V-ing form
I can be callusing you can be callusing he can be callusing we can be callusing you can be callusing they can be callusing
Perfect
I can have callused you can have callused he can have callused we can have callused you can have callused they can have callused
V-ing perfect
I can have been callusing you can have been callusing he can have been callusing we can have been callusing you can have been callusing they can have been callusing
Negation
Simple form
I cannot callus you cannot callus he cannot callus we cannot callus you cannot callus they cannot callus
V-ing form
I cannot be callusing you cannot be callusing he cannot be callusing we cannot be callusing you cannot be callusing they cannot be callusing
Perfect
I cannot have callused you cannot have callused he cannot have callused we cannot have callused you cannot have callused they cannot have callused
V-ing perfect
I cannot have been callusing you cannot have been callusing he cannot have been callusing we cannot have been callusing you cannot have been callusing they cannot have been callusing
Interrogative form
Simple form
can I callus? can you callus? can he callus? can we callus? can you callus? can they callus?
V-ing form
can I be callusing? can you be callusing? can he be callusing? can we be callusing? can you be callusing? can they be callusing?
Perfect
can I have callused? can you have callused? can he have callused? can we have callused? can you have callused? can they have callused?
V-ing perfect
can I have been callusing? can you have been callusing? can he have been callusing? can we have been callusing? can you have been callusing? can they have been callusing?
Interro-negative form
Simple form
can I not callus? can you not callus? can he not callus? can we not callus? can you not callus? can they not callus?
V-ing form
can I not be callusing? can you not be callusing? can he not be callusing? can we not be callusing? can you not be callusing? can they not be callusing?
Perfect
can I not have callused? can you not have callused? can he not have callused? can we not have callused? can you not have callused? can they not have callused?
V-ing perfect
can I not have been callusing? can you not have been callusing? can he not have been callusing? can we not have been callusing? can you not have been callusing? can they not have been callusing?