I can preacknowledge you can preacknowledge he can preacknowledge we can preacknowledge you can preacknowledge they can preacknowledge
V-ing form
I can be preacknowledging you can be preacknowledging he can be preacknowledging we can be preacknowledging you can be preacknowledging they can be preacknowledging
Perfect
I can have preacknowledged you can have preacknowledged he can have preacknowledged we can have preacknowledged you can have preacknowledged they can have preacknowledged
V-ing perfect
I can have been preacknowledging you can have been preacknowledging he can have been preacknowledging we can have been preacknowledging you can have been preacknowledging they can have been preacknowledging
Negation
Simple form
I can't preacknowledge you can't preacknowledge he can't preacknowledge we can't preacknowledge you can't preacknowledge they can't preacknowledge
V-ing form
I can't be preacknowledging you can't be preacknowledging he can't be preacknowledging we can't be preacknowledging you can't be preacknowledging they can't be preacknowledging
Perfect
I can't have preacknowledged you can't have preacknowledged he can't have preacknowledged we can't have preacknowledged you can't have preacknowledged they can't have preacknowledged
V-ing perfect
I can't have been preacknowledging you can't have been preacknowledging he can't have been preacknowledging we can't have been preacknowledging you can't have been preacknowledging they can't have been preacknowledging
Interrogative form
Simple form
can I preacknowledge? can you preacknowledge? can he preacknowledge? can we preacknowledge? can you preacknowledge? can they preacknowledge?
V-ing form
can I be preacknowledging? can you be preacknowledging? can he be preacknowledging? can we be preacknowledging? can you be preacknowledging? can they be preacknowledging?
Perfect
can I have preacknowledged? can you have preacknowledged? can he have preacknowledged? can we have preacknowledged? can you have preacknowledged? can they have preacknowledged?
V-ing perfect
can I have been preacknowledging? can you have been preacknowledging? can he have been preacknowledging? can we have been preacknowledging? can you have been preacknowledging? can they have been preacknowledging?
Interro-negative form
Simple form
can't I preacknowledge? can't you preacknowledge? can't he preacknowledge? can't we preacknowledge? can't you preacknowledge? can't they preacknowledge?
V-ing form
can't I be preacknowledging? can't you be preacknowledging? can't he be preacknowledging? can't we be preacknowledging? can't you be preacknowledging? can't they be preacknowledging?
Perfect
can't I have preacknowledged? can't you have preacknowledged? can't he have preacknowledged? can't we have preacknowledged? can't you have preacknowledged? can't they have preacknowledged?
V-ing perfect
can't I have been preacknowledging? can't you have been preacknowledging? can't he have been preacknowledging? can't we have been preacknowledging? can't you have been preacknowledging? can't they have been preacknowledging?