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 can't attempt you can't attempt he can't attempt we can't attempt you can't attempt they can't attempt
V-ing form
I can't be attempting you can't be attempting he can't be attempting we can't be attempting you can't be attempting they can't be attempting
Perfect
I can't have attempted you can't have attempted he can't have attempted we can't have attempted you can't have attempted they can't have attempted
V-ing perfect
I can't have been attempting you can't have been attempting he can't have been attempting we can't have been attempting you can't have been attempting they can't 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't I attempt? can't you attempt? can't he attempt? can't we attempt? can't you attempt? can't they attempt?
V-ing form
can't I be attempting? can't you be attempting? can't he be attempting? can't we be attempting? can't you be attempting? can't they be attempting?
Perfect
can't I have attempted? can't you have attempted? can't he have attempted? can't we have attempted? can't you have attempted? can't they have attempted?
V-ing perfect
can't I have been attempting? can't you have been attempting? can't he have been attempting? can't we have been attempting? can't you have been attempting? can't they have been attempting?