I can fell you can fell he can fell we can fell you can fell they can fell
V-ing form
I can be felling you can be felling he can be felling we can be felling you can be felling they can be felling
Perfect
I can have felled you can have felled he can have felled we can have felled you can have felled they can have felled
V-ing perfect
I can have been felling you can have been felling he can have been felling we can have been felling you can have been felling they can have been felling
Negation
Simple form
I can't fell you can't fell he can't fell we can't fell you can't fell they can't fell
V-ing form
I can't be felling you can't be felling he can't be felling we can't be felling you can't be felling they can't be felling
Perfect
I can't have felled you can't have felled he can't have felled we can't have felled you can't have felled they can't have felled
V-ing perfect
I can't have been felling you can't have been felling he can't have been felling we can't have been felling you can't have been felling they can't have been felling
Interrogative form
Simple form
can I fell? can you fell? can he fell? can we fell? can you fell? can they fell?
V-ing form
can I be felling? can you be felling? can he be felling? can we be felling? can you be felling? can they be felling?
Perfect
can I have felled? can you have felled? can he have felled? can we have felled? can you have felled? can they have felled?
V-ing perfect
can I have been felling? can you have been felling? can he have been felling? can we have been felling? can you have been felling? can they have been felling?
Interro-negative form
Simple form
can't I fell? can't you fell? can't he fell? can't we fell? can't you fell? can't they fell?
V-ing form
can't I be felling? can't you be felling? can't he be felling? can't we be felling? can't you be felling? can't they be felling?
Perfect
can't I have felled? can't you have felled? can't he have felled? can't we have felled? can't you have felled? can't they have felled?
V-ing perfect
can't I have been felling? can't you have been felling? can't he have been felling? can't we have been felling? can't you have been felling? can't they have been felling?