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 cannot flower you cannot flower he cannot flower we cannot flower you cannot flower they cannot flower
V-ing form
I cannot be flowering you cannot be flowering he cannot be flowering we cannot be flowering you cannot be flowering they cannot be flowering
Perfect
I cannot have flowered you cannot have flowered he cannot have flowered we cannot have flowered you cannot have flowered they cannot have flowered
V-ing perfect
I cannot have been flowering you cannot have been flowering he cannot have been flowering we cannot have been flowering you cannot have been flowering they cannot 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 I not flower? can you not flower? can he not flower? can we not flower? can you not flower? can they not flower?
V-ing form
can I not be flowering? can you not be flowering? can he not be flowering? can we not be flowering? can you not be flowering? can they not be flowering?
Perfect
can I not have flowered? can you not have flowered? can he not have flowered? can we not have flowered? can you not have flowered? can they not have flowered?
V-ing perfect
can I not have been flowering? can you not have been flowering? can he not have been flowering? can we not have been flowering? can you not have been flowering? can they not have been flowering?