I can snowplow you can snowplow he can snowplow we can snowplow you can snowplow they can snowplow
V-ing form
I can be snowplowing you can be snowplowing he can be snowplowing we can be snowplowing you can be snowplowing they can be snowplowing
Perfect
I can have snowplowed you can have snowplowed he can have snowplowed we can have snowplowed you can have snowplowed they can have snowplowed
V-ing perfect
I can have been snowplowing you can have been snowplowing he can have been snowplowing we can have been snowplowing you can have been snowplowing they can have been snowplowing
Negation
Simple form
I can't snowplow you can't snowplow he can't snowplow we can't snowplow you can't snowplow they can't snowplow
V-ing form
I can't be snowplowing you can't be snowplowing he can't be snowplowing we can't be snowplowing you can't be snowplowing they can't be snowplowing
Perfect
I can't have snowplowed you can't have snowplowed he can't have snowplowed we can't have snowplowed you can't have snowplowed they can't have snowplowed
V-ing perfect
I can't have been snowplowing you can't have been snowplowing he can't have been snowplowing we can't have been snowplowing you can't have been snowplowing they can't have been snowplowing
Interrogative form
Simple form
can I snowplow? can you snowplow? can he snowplow? can we snowplow? can you snowplow? can they snowplow?
V-ing form
can I be snowplowing? can you be snowplowing? can he be snowplowing? can we be snowplowing? can you be snowplowing? can they be snowplowing?
Perfect
can I have snowplowed? can you have snowplowed? can he have snowplowed? can we have snowplowed? can you have snowplowed? can they have snowplowed?
V-ing perfect
can I have been snowplowing? can you have been snowplowing? can he have been snowplowing? can we have been snowplowing? can you have been snowplowing? can they have been snowplowing?
Interro-negative form
Simple form
can't I snowplow? can't you snowplow? can't he snowplow? can't we snowplow? can't you snowplow? can't they snowplow?
V-ing form
can't I be snowplowing? can't you be snowplowing? can't he be snowplowing? can't we be snowplowing? can't you be snowplowing? can't they be snowplowing?
Perfect
can't I have snowplowed? can't you have snowplowed? can't he have snowplowed? can't we have snowplowed? can't you have snowplowed? can't they have snowplowed?
V-ing perfect
can't I have been snowplowing? can't you have been snowplowing? can't he have been snowplowing? can't we have been snowplowing? can't you have been snowplowing? can't they have been snowplowing?