I can press you can press she can press we can press you can press they can press
V-ing form
I can be pressing you can be pressing she can be pressing we can be pressing you can be pressing they can be pressing
Perfect
I can have pressed you can have pressed she 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 she 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 she cannot press we cannot press you cannot press they cannot press
V-ing form
I cannot be pressing you cannot be pressing she cannot be pressing we cannot be pressing you cannot be pressing they cannot be pressing
Perfect
I cannot have pressed you cannot have pressed she 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 she 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 she press? can we press? can you press? can they press?
V-ing form
can I be pressing? can you be pressing? can she be pressing? can we be pressing? can you be pressing? can they be pressing?
Perfect
can I have pressed? can you have pressed? can she 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 she 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 she 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 she 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 she 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 she not have been pressing? can we not have been pressing? can you not have been pressing? can they not have been pressing?