I can flower you can flower he can flower we can flower you can flower they can flower
V-ing form
I can be flowering you can be flowering he can be flowering we can be flowering you can be flowering they can be flowering
Perfect
I can have flowered you can have flowered he can have flowered we can have flowered you can have flowered they can have flowered
V-ing perfect
I can have been flowering you can have been flowering he can have been flowering we can have been flowering you can have been flowering they can have been flowering
Negation
Simple form
I can't flower you can't flower he can't flower we can't flower you can't flower they can't flower
V-ing form
I can't be flowering you can't be flowering he can't be flowering we can't be flowering you can't be flowering they can't be flowering
Perfect
I can't have flowered you can't have flowered he can't have flowered we can't have flowered you can't have flowered they can't have flowered
V-ing perfect
I can't have been flowering you can't have been flowering he can't have been flowering we can't have been flowering you can't have been flowering they can't have been flowering
Interrogative form
Simple form
can I flower? can you flower? can he flower? can we flower? can you flower? can they flower?
V-ing form
can I be flowering? can you be flowering? can he be flowering? can we be flowering? can you be flowering? can they be flowering?
Perfect
can I have flowered? can you have flowered? can he have flowered? can we have flowered? can you have flowered? can they have flowered?
V-ing perfect
can I have been flowering? can you have been flowering? can he have been flowering? can we have been flowering? can you have been flowering? can they have been flowering?
Interro-negative form
Simple form
can't I flower? can't you flower? can't he flower? can't we flower? can't you flower? can't they flower?
V-ing form
can't I be flowering? can't you be flowering? can't he be flowering? can't we be flowering? can't you be flowering? can't they be flowering?
Perfect
can't I have flowered? can't you have flowered? can't he have flowered? can't we have flowered? can't you have flowered? can't they have flowered?
V-ing perfect
can't I have been flowering? can't you have been flowering? can't he have been flowering? can't we have been flowering? can't you have been flowering? can't they have been flowering?