I can picket you can picket she can picket we can picket you can picket they can picket
V-ing form
I can be picketing you can be picketing she can be picketing we can be picketing you can be picketing they can be picketing
Perfect
I can have picketed you can have picketed she can have picketed we can have picketed you can have picketed they can have picketed
V-ing perfect
I can have been picketing you can have been picketing she can have been picketing we can have been picketing you can have been picketing they can have been picketing
Negation
Simple form
I cannot picket you cannot picket she cannot picket we cannot picket you cannot picket they cannot picket
V-ing form
I cannot be picketing you cannot be picketing she cannot be picketing we cannot be picketing you cannot be picketing they cannot be picketing
Perfect
I cannot have picketed you cannot have picketed she cannot have picketed we cannot have picketed you cannot have picketed they cannot have picketed
V-ing perfect
I cannot have been picketing you cannot have been picketing she cannot have been picketing we cannot have been picketing you cannot have been picketing they cannot have been picketing
Interrogative form
Simple form
can I picket? can you picket? can she picket? can we picket? can you picket? can they picket?
V-ing form
can I be picketing? can you be picketing? can she be picketing? can we be picketing? can you be picketing? can they be picketing?
Perfect
can I have picketed? can you have picketed? can she have picketed? can we have picketed? can you have picketed? can they have picketed?
V-ing perfect
can I have been picketing? can you have been picketing? can she have been picketing? can we have been picketing? can you have been picketing? can they have been picketing?
Interro-negative form
Simple form
can I not picket? can you not picket? can she not picket? can we not picket? can you not picket? can they not picket?
V-ing form
can I not be picketing? can you not be picketing? can she not be picketing? can we not be picketing? can you not be picketing? can they not be picketing?
Perfect
can I not have picketed? can you not have picketed? can she not have picketed? can we not have picketed? can you not have picketed? can they not have picketed?
V-ing perfect
can I not have been picketing? can you not have been picketing? can she not have been picketing? can we not have been picketing? can you not have been picketing? can they not have been picketing?