I can constringe you can constringe he can constringe we can constringe you can constringe they can constringe
V-ing form
I can be constringing you can be constringing he can be constringing we can be constringing you can be constringing they can be constringing
Perfect
I can have constringed you can have constringed he can have constringed we can have constringed you can have constringed they can have constringed
V-ing perfect
I can have been constringing you can have been constringing he can have been constringing we can have been constringing you can have been constringing they can have been constringing
Negation
Simple form
I cannot constringe you cannot constringe he cannot constringe we cannot constringe you cannot constringe they cannot constringe
V-ing form
I cannot be constringing you cannot be constringing he cannot be constringing we cannot be constringing you cannot be constringing they cannot be constringing
Perfect
I cannot have constringed you cannot have constringed he cannot have constringed we cannot have constringed you cannot have constringed they cannot have constringed
V-ing perfect
I cannot have been constringing you cannot have been constringing he cannot have been constringing we cannot have been constringing you cannot have been constringing they cannot have been constringing
Interrogative form
Simple form
can I constringe? can you constringe? can he constringe? can we constringe? can you constringe? can they constringe?
V-ing form
can I be constringing? can you be constringing? can he be constringing? can we be constringing? can you be constringing? can they be constringing?
Perfect
can I have constringed? can you have constringed? can he have constringed? can we have constringed? can you have constringed? can they have constringed?
V-ing perfect
can I have been constringing? can you have been constringing? can he have been constringing? can we have been constringing? can you have been constringing? can they have been constringing?
Interro-negative form
Simple form
can I not constringe? can you not constringe? can he not constringe? can we not constringe? can you not constringe? can they not constringe?
V-ing form
can I not be constringing? can you not be constringing? can he not be constringing? can we not be constringing? can you not be constringing? can they not be constringing?
Perfect
can I not have constringed? can you not have constringed? can he not have constringed? can we not have constringed? can you not have constringed? can they not have constringed?
V-ing perfect
can I not have been constringing? can you not have been constringing? can he not have been constringing? can we not have been constringing? can you not have been constringing? can they not have been constringing?