I can press you can press he can press we can press you can press they can press
V-ing form
I can be pressing you can be pressing he can be pressing we can be pressing you can be pressing they can be pressing
Perfect
I can have pressed you can have pressed he can have pressed we can have pressed you can have pressed they can have pressed
V-ing perfect
I can have been pressing you can have been pressing he can have been pressing we can have been pressing you can have been pressing they can have been pressing
Negation
Simple form
I cannot press you cannot press he cannot press we cannot press you cannot press they cannot press
V-ing form
I cannot be pressing you cannot be pressing he cannot be pressing we cannot be pressing you cannot be pressing they cannot be pressing
Perfect
I cannot have pressed you cannot have pressed he cannot have pressed we cannot have pressed you cannot have pressed they cannot have pressed
V-ing perfect
I cannot have been pressing you cannot have been pressing he cannot have been pressing we cannot have been pressing you cannot have been pressing they cannot have been pressing
Interrogative form
Simple form
can I press? can you press? can he press? can we press? can you press? can they press?
V-ing form
can I be pressing? can you be pressing? can he be pressing? can we be pressing? can you be pressing? can they be pressing?
Perfect
can I have pressed? can you have pressed? can he have pressed? can we have pressed? can you have pressed? can they have pressed?
V-ing perfect
can I have been pressing? can you have been pressing? can he have been pressing? can we have been pressing? can you have been pressing? can they have been pressing?
Interro-negative form
Simple form
can I not press? can you not press? can he not press? can we not press? can you not press? can they not press?
V-ing form
can I not be pressing? can you not be pressing? can he not be pressing? can we not be pressing? can you not be pressing? can they not be pressing?
Perfect
can I not have pressed? can you not have pressed? can he not have pressed? can we not have pressed? can you not have pressed? can they not have pressed?
V-ing perfect
can I not have been pressing? can you not have been pressing? can he not have been pressing? can we not have been pressing? can you not have been pressing? can they not have been pressing?