I can attempt you can attempt he can attempt we can attempt you can attempt they can attempt
V-ing form
I can be attempting you can be attempting he can be attempting we can be attempting you can be attempting they can be attempting
Perfect
I can have attempted you can have attempted he can have attempted we can have attempted you can have attempted they can have attempted
V-ing perfect
I can have been attempting you can have been attempting he can have been attempting we can have been attempting you can have been attempting they can have been attempting
Negation
Simple form
I cannot attempt you cannot attempt he cannot attempt we cannot attempt you cannot attempt they cannot attempt
V-ing form
I cannot be attempting you cannot be attempting he cannot be attempting we cannot be attempting you cannot be attempting they cannot be attempting
Perfect
I cannot have attempted you cannot have attempted he cannot have attempted we cannot have attempted you cannot have attempted they cannot have attempted
V-ing perfect
I cannot have been attempting you cannot have been attempting he cannot have been attempting we cannot have been attempting you cannot have been attempting they cannot have been attempting
Interrogative form
Simple form
can I attempt? can you attempt? can he attempt? can we attempt? can you attempt? can they attempt?
V-ing form
can I be attempting? can you be attempting? can he be attempting? can we be attempting? can you be attempting? can they be attempting?
Perfect
can I have attempted? can you have attempted? can he have attempted? can we have attempted? can you have attempted? can they have attempted?
V-ing perfect
can I have been attempting? can you have been attempting? can he have been attempting? can we have been attempting? can you have been attempting? can they have been attempting?
Interro-negative form
Simple form
can I not attempt? can you not attempt? can he not attempt? can we not attempt? can you not attempt? can they not attempt?
V-ing form
can I not be attempting? can you not be attempting? can he not be attempting? can we not be attempting? can you not be attempting? can they not be attempting?
Perfect
can I not have attempted? can you not have attempted? can he not have attempted? can we not have attempted? can you not have attempted? can they not have attempted?
V-ing perfect
can I not have been attempting? can you not have been attempting? can he not have been attempting? can we not have been attempting? can you not have been attempting? can they not have been attempting?