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 cannot preacknowledge you cannot preacknowledge he cannot preacknowledge we cannot preacknowledge you cannot preacknowledge they cannot preacknowledge
V-ing form
I cannot be preacknowledging you cannot be preacknowledging he cannot be preacknowledging we cannot be preacknowledging you cannot be preacknowledging they cannot be preacknowledging
Perfect
I cannot have preacknowledged you cannot have preacknowledged he cannot have preacknowledged we cannot have preacknowledged you cannot have preacknowledged they cannot have preacknowledged
V-ing perfect
I cannot have been preacknowledging you cannot have been preacknowledging he cannot have been preacknowledging we cannot have been preacknowledging you cannot have been preacknowledging they cannot 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 I not preacknowledge? can you not preacknowledge? can he not preacknowledge? can we not preacknowledge? can you not preacknowledge? can they not preacknowledge?
V-ing form
can I not be preacknowledging? can you not be preacknowledging? can he not be preacknowledging? can we not be preacknowledging? can you not be preacknowledging? can they not be preacknowledging?
Perfect
can I not have preacknowledged? can you not have preacknowledged? can he not have preacknowledged? can we not have preacknowledged? can you not have preacknowledged? can they not have preacknowledged?
V-ing perfect
can I not have been preacknowledging? can you not have been preacknowledging? can he not have been preacknowledging? can we not have been preacknowledging? can you not have been preacknowledging? can they not have been preacknowledging?