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 cannot snowplow you cannot snowplow he cannot snowplow we cannot snowplow you cannot snowplow they cannot snowplow
V-ing form
I cannot be snowplowing you cannot be snowplowing he cannot be snowplowing we cannot be snowplowing you cannot be snowplowing they cannot be snowplowing
Perfect
I cannot have snowplowed you cannot have snowplowed he cannot have snowplowed we cannot have snowplowed you cannot have snowplowed they cannot have snowplowed
V-ing perfect
I cannot have been snowplowing you cannot have been snowplowing he cannot have been snowplowing we cannot have been snowplowing you cannot have been snowplowing they cannot 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 I not snowplow? can you not snowplow? can he not snowplow? can we not snowplow? can you not snowplow? can they not snowplow?
V-ing form
can I not be snowplowing? can you not be snowplowing? can he not be snowplowing? can we not be snowplowing? can you not be snowplowing? can they not be snowplowing?
Perfect
can I not have snowplowed? can you not have snowplowed? can he not have snowplowed? can we not have snowplowed? can you not have snowplowed? can they not have snowplowed?
V-ing perfect
can I not have been snowplowing? can you not have been snowplowing? can he not have been snowplowing? can we not have been snowplowing? can you not have been snowplowing? can they not have been snowplowing?