I can packet you can packet he can packet we can packet you can packet they can packet
V-ing form
I can be packeting you can be packeting he can be packeting we can be packeting you can be packeting they can be packeting
Perfect
I can have packeted you can have packeted he can have packeted we can have packeted you can have packeted they can have packeted
V-ing perfect
I can have been packeting you can have been packeting he can have been packeting we can have been packeting you can have been packeting they can have been packeting
Negation
Simple form
I can't packet you can't packet he can't packet we can't packet you can't packet they can't packet
V-ing form
I can't be packeting you can't be packeting he can't be packeting we can't be packeting you can't be packeting they can't be packeting
Perfect
I can't have packeted you can't have packeted he can't have packeted we can't have packeted you can't have packeted they can't have packeted
V-ing perfect
I can't have been packeting you can't have been packeting he can't have been packeting we can't have been packeting you can't have been packeting they can't have been packeting
Interrogative form
Simple form
can I packet? can you packet? can he packet? can we packet? can you packet? can they packet?
V-ing form
can I be packeting? can you be packeting? can he be packeting? can we be packeting? can you be packeting? can they be packeting?
Perfect
can I have packeted? can you have packeted? can he have packeted? can we have packeted? can you have packeted? can they have packeted?
V-ing perfect
can I have been packeting? can you have been packeting? can he have been packeting? can we have been packeting? can you have been packeting? can they have been packeting?
Interro-negative form
Simple form
can't I packet? can't you packet? can't he packet? can't we packet? can't you packet? can't they packet?
V-ing form
can't I be packeting? can't you be packeting? can't he be packeting? can't we be packeting? can't you be packeting? can't they be packeting?
Perfect
can't I have packeted? can't you have packeted? can't he have packeted? can't we have packeted? can't you have packeted? can't they have packeted?
V-ing perfect
can't I have been packeting? can't you have been packeting? can't he have been packeting? can't we have been packeting? can't you have been packeting? can't they have been packeting?