I can forest you can forest she can forest we can forest you can forest they can forest
V-ing form
I can be foresting you can be foresting she can be foresting we can be foresting you can be foresting they can be foresting
Perfect
I can have forested you can have forested she can have forested we can have forested you can have forested they can have forested
V-ing perfect
I can have been foresting you can have been foresting she can have been foresting we can have been foresting you can have been foresting they can have been foresting
Negation
Simple form
I cannot forest you cannot forest she cannot forest we cannot forest you cannot forest they cannot forest
V-ing form
I cannot be foresting you cannot be foresting she cannot be foresting we cannot be foresting you cannot be foresting they cannot be foresting
Perfect
I cannot have forested you cannot have forested she cannot have forested we cannot have forested you cannot have forested they cannot have forested
V-ing perfect
I cannot have been foresting you cannot have been foresting she cannot have been foresting we cannot have been foresting you cannot have been foresting they cannot have been foresting
Interrogative form
Simple form
can I forest? can you forest? can she forest? can we forest? can you forest? can they forest?
V-ing form
can I be foresting? can you be foresting? can she be foresting? can we be foresting? can you be foresting? can they be foresting?
Perfect
can I have forested? can you have forested? can she have forested? can we have forested? can you have forested? can they have forested?
V-ing perfect
can I have been foresting? can you have been foresting? can she have been foresting? can we have been foresting? can you have been foresting? can they have been foresting?
Interro-negative form
Simple form
can I not forest? can you not forest? can she not forest? can we not forest? can you not forest? can they not forest?
V-ing form
can I not be foresting? can you not be foresting? can she not be foresting? can we not be foresting? can you not be foresting? can they not be foresting?
Perfect
can I not have forested? can you not have forested? can she not have forested? can we not have forested? can you not have forested? can they not have forested?
V-ing perfect
can I not have been foresting? can you not have been foresting? can she not have been foresting? can we not have been foresting? can you not have been foresting? can they not have been foresting?