I can act you can act he can act we can act you can act they can act
V-ing form
I can be acting you can be acting he can be acting we can be acting you can be acting they can be acting
Perfect
I can have acted you can have acted he can have acted we can have acted you can have acted they can have acted
V-ing perfect
I can have been acting you can have been acting he can have been acting we can have been acting you can have been acting they can have been acting
Negation
Simple form
I cannot act you cannot act he cannot act we cannot act you cannot act they cannot act
V-ing form
I cannot be acting you cannot be acting he cannot be acting we cannot be acting you cannot be acting they cannot be acting
Perfect
I cannot have acted you cannot have acted he cannot have acted we cannot have acted you cannot have acted they cannot have acted
V-ing perfect
I cannot have been acting you cannot have been acting he cannot have been acting we cannot have been acting you cannot have been acting they cannot have been acting
Interrogative form
Simple form
can I act? can you act? can he act? can we act? can you act? can they act?
V-ing form
can I be acting? can you be acting? can he be acting? can we be acting? can you be acting? can they be acting?
Perfect
can I have acted? can you have acted? can he have acted? can we have acted? can you have acted? can they have acted?
V-ing perfect
can I have been acting? can you have been acting? can he have been acting? can we have been acting? can you have been acting? can they have been acting?
Interro-negative form
Simple form
can I not act? can you not act? can he not act? can we not act? can you not act? can they not act?
V-ing form
can I not be acting? can you not be acting? can he not be acting? can we not be acting? can you not be acting? can they not be acting?
Perfect
can I not have acted? can you not have acted? can he not have acted? can we not have acted? can you not have acted? can they not have acted?
V-ing perfect
can I not have been acting? can you not have been acting? can he not have been acting? can we not have been acting? can you not have been acting? can they not have been acting?