I can forest you can forest he can forest we can forest you can forest they can forest
V-ing form
I can be foresting you can be foresting he can be foresting we can be foresting you can be foresting they can be foresting
Perfect
I can have forested you can have forested he 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 he 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 he cannot forest we cannot forest you cannot forest they cannot forest
V-ing form
I cannot be foresting you cannot be foresting he cannot be foresting we cannot be foresting you cannot be foresting they cannot be foresting
Perfect
I cannot have forested you cannot have forested he 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 he 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 he forest? can we forest? can you forest? can they forest?
V-ing form
can I be foresting? can you be foresting? can he be foresting? can we be foresting? can you be foresting? can they be foresting?
Perfect
can I have forested? can you have forested? can he 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 he 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 he 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 he 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 he 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 he not have been foresting? can we not have been foresting? can you not have been foresting? can they not have been foresting?